docs(agents): update technical writing guidance and skills to avoid using see when referring to things.

[lamek]

Updated guidance on using "see" to refer to things.

Presubmit checklist

• If you are unwilling, or unable, to sign the CLA, even for a tiny, one-word PR, please file an issue instead of a PR.
• If this PR is not meant to land until a future stable release, mark it as draft with an explanation.
• This PR follows the Google Developer Documentation Style Guidelines—for example, it doesn't use i.e. or e.g., and it avoids I and we (first-person pronouns).
• This PR uses semantic line breaks
  of 80 characters or fewer.

[gemini-code-assist]

Code Review

This pull request updates the technical documentation style guides across several files to discourage the use of "see" or "see the" when introducing links or cross-references, recommending action-oriented alternatives like "refer to", "consult", or "visit" instead. Feedback was provided on formatting-and-structure.md to correct the placement of a comma in an example, ensuring it is placed inside the closing quotation mark in accordance with the style guide.

[flutter-website-bot]

Staged preview of the updated docs.flutter.dev site (updated for commit 722736e):

https://flutter-docs-prod--docs-pr13820-proofread-avoid-see-tmelt011.web.app

[flutter-website-bot]

Staged preview of the updated flutter.dev site (updated for commit 722736e):

https://flutter-dev-230821--www-pr13820-proofread-avoid-see-q99diu1c.web.app

[sfshaza2]

It makes ME happy! lgtm