Add a glossary entry for jank

[sfshaza2]

I looked through our video offerings and didn't find anything particularly pertinent to this topic. (I was hoping to find a performance tool video, for example.)

cc @kenzieschmoll @khanhnwin

[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 enhances the project's documentation by introducing a new glossary entry for 'Jank,' a critical term related to application performance. This new entry provides a clear definition, explains its causes, and points to relevant tools and resources for diagnosis and resolution. Additionally, it refines the existing 'Hot reload' definition for improved clarity.

Highlights

• New Glossary Entry for 'Jank': A comprehensive definition for 'Jank' has been added to the glossary.yml file. This entry includes a short description, a detailed long description explaining its causes and how Flutter helps diagnose it, related documentation links, and relevant labels like 'performance' and 'smooth rendering'.
• Refinement of 'Hot reload' Definition: The short description for 'Hot reload' was updated to remove the parenthetical phrase '(also called "stateful hot reload")' for improved conciseness and clarity.

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[gemini-code-assist]

Code Review

This pull request adds a new glossary entry for 'jank' and makes a minor clarification to the 'Hot reload' entry. The new entry for 'jank' is well-structured with relevant links and labels. I've suggested a small wording improvement to the short description for 'jank' to enhance clarity. Overall, this is a great addition to the documentation.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit ce90aff):

https://flutter-docs-prod--pr12759-jank-937k0r1k.web.app

[parlough]

Love it! Thanks @sfshaza2 :D