Add glossary entries for hot reload and hot restart

[sfshaza2]

Also updates the web faq regarding hot reload.

Fixes #12644
Fixes #12746

[gemini-code-assist]

Summary of Changes

Hello @sfshaza2, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Flutter website's documentation by introducing clear and detailed definitions for "Hot reload" and "Hot restart" within the glossary. It also refines existing content in the web FAQ to ensure accuracy regarding the current state of hot reload for web applications, thereby improving the overall clarity and user experience for developers seeking information on these fundamental Flutter development features.

Highlights

• New Glossary Entries: Added comprehensive glossary entries for "Hot reload" and "Hot restart" to the src/data/glossary.yml file, providing detailed explanations and related resources.
• Web FAQ Update: Updated the src/content/platform-integration/web/faq.md file to remove the mention of hot reload being behind an experimental flag for web apps, reflecting its current stable status, and clarified the description of hot restart.
• Documentation Anchor: Added a specific anchor ({#hot-restart}) to the hot reload documentation in src/content/tools/hot-reload.md to allow direct linking to the section differentiating hot reload, hot restart, and full restart.

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[gemini-code-assist]

Code Review

This pull request adds glossary entries for "hot reload" and "hot restart", and updates the web FAQ to reflect that hot reload is no longer an experimental feature. The changes are generally good, but I've suggested a couple of minor wording improvements in the new glossary entries for better clarity and grammatical correctness.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit a847e55):

https://flutter-docs-prod--pr12757-hot-rest-cf7rp1jo.web.app

[ericwindmill]

LGTM, but a link is broken

[parlough]

Some suggestions to consider, but looks great to me! Thanks for also tackling the outdated faq mention.