chore(docs): fixed typos (#2899)

docs/getting-started/bootstrap4.md

@@ -8,7 +8,7 @@ The important thing to note is the final section - you must let ngx-bootstrap kn
 
 *Important*: please check `angular-cli` version, it should be => "1.0.0-beta.24 (at the time or writing it is at 1.0.0-rc.0)"
 
-*Note*: you can skip this part if you already have application generated by `ng-cli` and webpack
+*Note*: You can skip this part if you already have application generated by `ng-cli` and webpack.
 
 ```bash
 npm i -g @angular/cli
@@ -17,9 +17,9 @@ cd my-app
 ng serve
 ```
 
-#### Adding ngx-bootstrap and bootstrap 4
+#### Adding ngx-bootstrap and Bootstrap 4
 
- - install `ngx-bootstrap` and `bootstrap 4`
+ - install `ngx-bootstrap` and `Bootstrap 4`
 
  ```bash
    npm install ngx-bootstrap bootstrap@next --save
@@ -28,7 +28,7 @@ ng serve
 ### Using with css
 #### Configuring Project
 
-Now that the project is set up it must be configured to include the bootstrap CSS.
+Now that the project is set up it must be configured to include the Bootstrap CSS.
 
  - Open the file .angular-cli.json from the root of your project.
  - Under the property apps the first item in that array is the default application.
@@ -83,7 +83,7 @@ In `styles.scss` add the following:
 @import '../node_modules/bootstrap/scss/bootstrap';
 ```
 
-### Let ngx-bootstrap know you are using BS4
+### Let ngx-bootstrap know you are using Bootstrap 4
 
 Open `/src/index.html` and add the following markup:
 
@@ -97,7 +97,8 @@ Open `/src/index.html` and add the following markup:
 ```
 
 ### Testing
-- open `src/app/app.module.ts` and add
+
+Open `src/app/app.module.ts` and add
 
 ```typescript
 import { BsDropdownModule } from 'ngx-bootstrap/dropdown';