Add description for enabling experimental features

[bjee19]

Proposed changes

Add includes description for enabling experimental features and the risks that are associated with using experimental features.

Problem: There is insufficient documentation on enabling experimental features in our guides.

Solution: Add an includes description for enabling experimental features that we can use for any guides on experimental features. Also updated gateway api compatibility document.

Testing: Locally generated the documentation through Hugo and it works.

Closes #2481

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [x] I have read the CONTRIBUTING doc
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked that all unit tests pass after adding my changes
• [ ] I have updated necessary documentation
• [x] I have rebased my branch onto main
• [x] I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes, please add a brief note that summarizes the change.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.29%. Comparing base (d242622) to head (b58bc2c). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2546 +/- ## ======================================= Coverage 89.29% 89.29% ======================================= Files 100 100 Lines 7633 7633 Branches 50 50 ======================================= Hits 6816 6816 Misses 761 761 Partials 56 56 ```

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