docs: apply feedback comments for ai patterns' contents

[hinzzx]

With this change we're improving the content of the AI Acknowledgment and AI Quick Prompt patterns.

AI Quick Prompt Pattern

In the Rewrite Text submenu
- Summarise
+ Summarize

Error message:
- Spelling or grammar issues found, please try again!
+ Something went wrong during the generation process. Please try again.

Option:
- Fix Spelling & Grammar
+ Fix Spelling and Grammar

AI Acknowledgment Pattern

+ Cancel Button
+ New Boilerplate message
+ Explicit clarification about what "AI" abbreviation is.

[didip1000]

For consistency you may want to update the dev samples from "Summarise" to "Summarize" as well