More SEO Friendly Section links

CONTRIBUTING.md

@@ -2,13 +2,13 @@ Hello! Thank you for choosing to help contribute to one of the SendGrid open sou
 
 - [CLAs and CCLAs](#cla)
 - [Roadmap & Milestones](#roadmap)
-- [Feature Request](#feature_request)
-- [Submit a Bug Report](#submit_a_bug_report)
-- [Improvements to the Codebase](#improvements_to_the_codebase)
-- [Understanding the Code Base](#understanding_the_codebase)
+- [Feature Request](#feature-request)
+- [Submit a Bug Report](#submit-a-bug-report)
+- [Improvements to the Codebase](#improvements-to-the-codebase)
+- [Understanding the Code Base](#understanding-the-codebase)
 - [Testing](#testing)
-- [Style Guidelines & Naming Conventions](#style_guidelines_and_naming_conventions)
-- [Creating a Pull Request](#creating_a_pull_request)
+- [Style Guidelines & Naming Conventions](#style-guidelines-and-naming-conventions)
+- [Creating a Pull Request](#creating-a-pull-request)
 
 <a name="roadmap"></a>
 We use [Milestones](https://github.com/sendgrid/sendgrid-php/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions and additional PRs are welcomed and encouraged.
@@ -26,7 +26,7 @@ When you create a Pull Request, after a few seconds, a comment will appear with
 
 There are a few ways to contribute, which we'll enumerate below:
 
-<a name="feature_request"></a>
+<a name="feature-request"></a>
 ## Feature Request
 
 If you'd like to make a feature request, please read this section.
@@ -36,7 +36,7 @@ The GitHub issue tracker is the preferred channel for library feature requests,
 - Please **search for existing issues** in order to ensure we don't have duplicate bugs/feature requests.
 - Please be respectful and considerate of others when commenting on issues
 
-<a name="submit_a_bug_report"></a>
+<a name="submit-a-bug-report"></a>
 ## Submit a Bug Report
 
 Note: DO NOT include your credentials in ANY code examples, descriptions, or media you make public.
@@ -53,7 +53,7 @@ Before you decide to create a new issue, please try the following:
 
 In order to make the process easier, we've included a [sample bug report template](https://github.com/sendgrid/sendgrid-php/blob/master/.github/ISSUE_TEMPLATE) (borrowed from [Ghost](https://github.com/TryGhost/Ghost/)). The template uses [GitHub flavored markdown](https://help.github.com/articles/github-flavored-markdown/) for formatting.
 
-<a name="improvements_to_the_codebase"></a>
+<a name="improvements-to-the-codebase"></a>
 ## Improvements to the Codebase
 
 We welcome direct contributions to the sendgrid-php code base. Thank you!
@@ -92,7 +92,7 @@ See the [examples folder](https://github.com/sendgrid/sendgrid-php/tree/master/e
 
 If you are using composer, replace <PATH_TO> with the path to your `vendor/autoload.php`. Otherwise, include lib/loader.php.
 
-<a name="understanding_the_codebase"></a>
+<a name="understanding-the-codebase"></a>
 ## Understanding the Code Base
 
 **/examples**
@@ -126,7 +126,7 @@ cd test/unit
 ../../vendor/bin/phpunit . --bootstrap bootstrap.php --filter test*
 ```
 
-<a name="style_guidelines_and_naming_conventions"></a>
+<a name="style-guidelines-and-naming-conventions"></a>
 ## Style Guidelines & Naming Conventions
 
 Generally, we follow the style guidelines as suggested by the official language. However, we ask that you conform to the styles that already exist in the library. If you wish to deviate, please explain your reasoning.

README.md

@@ -17,9 +17,9 @@ We appreciate your continued support, thank you!
 # Table of Contents
 
 * [Installation](#installation)
-* [Quick Start](#quick_start)
+* [Quick Start](#quick-start)
 * [Usage](#usage)
-* [Use Cases](#use_cases)
+* [Use Cases](#use-cases)
 * [Announcements](#announcements)
 * [Roadmap](#roadmap)
 * [How to Contribute](#contribute)
@@ -70,7 +70,7 @@ Previous versions of the library can be found in the [version index](https://sen
 - The SendGrid Service, starting at the [free level](https://sendgrid.com/free?source=sendgrid-php)
 - [php-HTTP-Client](https://github.com/sendgrid/php-http-client)
 
-<a name="quick_start"></a>
+<a name="quick-start"></a>
 # Quick Start
 
 ## Hello Email
@@ -195,7 +195,7 @@ print $response->body();
 - [How-to: Migration from v2 to v3](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/how_to_migrate_from_v2_to_v3_mail_send.html)
 - [v3 Web API Mail Send Helper](https://github.com/sendgrid/sendgrid-php/tree/master/lib/helpers/mail/README.md) - build a request object payload for a v3 /mail/send API call.
 
-<a name="use_cases"></a>
+<a name="use-cases"></a>
 # Use Cases
 
 [Examples of common API use cases](https://github.com/sendgrid/sendgrid-php/blob/master/USE_CASES.md), such as how to send an email with a transactional template.

USAGE.md

@@ -13,9 +13,9 @@ $sg = new \SendGrid($apiKey);
 
 # Table of Contents
 
-* [ACCESS SETTINGS](#access_settings)
+* [ACCESS SETTINGS](#access-settings)
 * [ALERTS](#alerts)
-* [API KEYS](#api_keys)
+* [API KEYS](#api-keys)
 * [ASM](#asm)
 * [BROWSERS](#browsers)
 * [CAMPAIGNS](#campaigns)
@@ -26,21 +26,21 @@ $sg = new \SendGrid($apiKey);
 * [GEO](#geo)
 * [IPS](#ips)
 * [MAIL](#mail)
-* [MAIL SETTINGS](#mail_settings)
-* [MAILBOX PROVIDERS](#mailbox_providers)
-* [PARTNER SETTINGS](#partner_settings)
+* [MAIL SETTINGS](#mail-settings)
+* [MAILBOX PROVIDERS](#mailbox-providers)
+* [PARTNER SETTINGS](#partner-settings)
 * [SCOPES](#scopes)
 * [SENDERS](#senders)
 * [STATS](#stats)
 * [SUBUSERS](#subusers)
 * [SUPPRESSION](#suppression)
 * [TEMPLATES](#templates)
-* [TRACKING SETTINGS](#tracking_settings)
+* [TRACKING SETTINGS](#tracking-settings)
 * [USER](#user)
 * [WHITELABEL](#whitelabel)
 
 
-<a name="access_settings"></a>
+<a name="access-settings"></a>
 # ACCESS SETTINGS
 
 ## Retrieve all recent access attempts
@@ -285,7 +285,7 @@ echo $response->statusCode();
 echo $response->body();
 print_r($response->headers());
 ```
-<a name="api_keys"></a>
+<a name="api-keys"></a>
 # API KEYS
 
 ## Create API keys
@@ -2251,7 +2251,7 @@ echo $response->statusCode();
 echo $response->body();
 print_r($response->headers());
 ```
-<a name="mail_settings"></a>
+<a name="mail-settings"></a>
 # MAIL SETTINGS
 
 ## Retrieve all mail settings
@@ -2621,7 +2621,7 @@ echo $response->statusCode();
 echo $response->body();
 print_r($response->headers());
 ```
-<a name="mailbox_providers"></a>
+<a name="mailbox-providers"></a>
 # MAILBOX PROVIDERS
 
 ## Retrieve email statistics by mailbox provider.
@@ -2642,7 +2642,7 @@ echo $response->statusCode();
 echo $response->body();
 print_r($response->headers());
 ```
-<a name="partner_settings"></a>
+<a name="partner-settings"></a>
 # PARTNER SETTINGS
 
 ## Returns a list of all partner settings.
@@ -3753,7 +3753,7 @@ echo $response->statusCode();
 echo $response->body();
 print_r($response->headers());
 ```
-<a name="tracking_settings"></a>
+<a name="tracking-settings"></a>
 # TRACKING SETTINGS
 
 ## Retrieve Tracking Settings

USE_CASES.md

@@ -2,9 +2,9 @@ This documentation provides examples for specific use cases. Please [open an iss
 
 # Table of Contents
 * [Attachments](#attachments)
-* [Transactional Templates](#transactional_templates)
-* [How to Setup a Domain Whitelabel](#domain_whitelabel)
-* [How to View Email Statistics](#email_stats)
+* [Transactional Templates](#transactional-templates)
+* [How to Setup a Domain Whitelabel](#domain-whitelabel)
+* [How to View Email Statistics](#email-stats)
 
 <a name="attachments"></a>
 # Attachments
@@ -46,7 +46,7 @@ echo $response->body();
 ?>
 ```
 
-<a name="transactional_templates"></a>
+<a name="transactional-templates"></a>
 # Transactional Templates
 
 For this example, we assume you have created a [transactional template](https://sendgrid.com/docs/User_Guide/Transactional_Templates/index.html). Following is the template content we used for testing.
@@ -169,14 +169,14 @@ echo $response->body();
 print_r($response->headers());
 ```
 
-<a name="domain_whitelabel"></a>
+<a name="domain-whitelabel"></a>
 # How to Setup a Domain Whitelabel
 
 You can find documentation for how to setup a domain whitelabel via the UI [here](https://sendgrid.com/docs/Classroom/Basics/Whitelabel/setup_domain_whitelabel.html) and via API [here](https://github.com/sendgrid/sendgrid-php/blob/master/USAGE.md#whitelabel).
 
 Find more information about all of SendGrid's whitelabeling related documentation [here](https://sendgrid.com/docs/Classroom/Basics/Whitelabel/index.html).
 
-<a name="email_stats"></a>
+<a name="email-stats"></a>
 # How to View Email Statistics
 
 You can find documentation for how to view your email statistics via the UI [here](https://app.sendgrid.com/statistics) and via API [here](https://github.com/sendgrid/sendgrid-php/blob/master/USAGE.md#stats).