Update faq.md

[sambellbraze]

Hello - this error message appears I believe for any customer when they are creating an email in Braze... but we don't link them to any docs which explain why this error message is appearing.

I believe my explanation in this update covers why the error message appears... but it might be worth validating this to 100% confirm.

Otherwise, I think we need this information in the FAQ to provide better clarity as a lot of customers use Liquid to insert an unsubscribe URL and the error still appears and customers then submit support cases on this.

Pull Request/Issue Resolution

Description of Change:

I'm changing..... (could be a link, a new image, a new section, etc.)... because...

Closes #ISSUE_NUMBER_HERE

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

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✔️ Pull Request Checklist

• Check that you haven't removed any images (replacing an image with an updated one of the same name is fine), as this breaks the French site
• Check that all links work.
• Ensure you have completed our Contributors License Agreement.
• Tag @josh-mccrowell-braze and @internetisaiah as a reviewer when your work is done and ready to be reviewed for merge. Are you an internal product manager? Reference the internal reviewing chart to tag the appropriate reviewer.
• If the documentation involves a 1) paid SKU, 2) a third party, 3) SMS, 4) AI, or 5) privacy, ensure that Ana Teresa Serafino on the Legal team has signed off.
• Tag others as reviewers as necessary.
• If you have modified any links, be sure to add redirects to assets > js > broken_redirect_list.js

⭐ Helpful Wiki Shortcuts

• Writing Style Guide
• Image Style Guide
• Styling Test Page

❗ ATTN: For PR Reviewers

• Read our Reviewing a PR page for more on our reviewing suggestions.
• Read our Previewing Documentation page to see how to check the deployment.
  • Preview all changes in the linked Vercel environment by clicking the preview link in the vercel-bot comment in your PR.

❗ ATTN: Internal Reviewing Chart

Work at Braze and not sure who to tag for review?
Before tagging @josh-mccrowell-braze or @internetisaiah for a general review, reference the following chart to see if a specific product vertical/reviewer applies to your pull request.

Reviewer	Product Vertical
@josh-mccrowell-braze	Monolith Deployments Quality Infrastructure Platform Infrastructure Datalake SDKs Currents
@internetisaiah	Developer Guide Technology partners Channels
@bre-fitzgerald	Intelligence In-App Messages Channels Frontend Infrastructure & Experience (FIX)
@lydia-xie	Ingestion Core Objects Core Messaging Messaging Experience Message Components Email (Composition and Infrastructure) (tag @rachel-feinberg for Liquid use cases)
@rachel-feinberg	Customer Lifecycle, Identity and Permissions SMS User Targeting Reporting

[lydia-xie]

Hey @sambellbraze - thanks for flagging this! I've incorporated your edit in this PR and it's currently in review with Product. Closing this PR, me know if you have any questions or additional feedback!