docs: clarify forked pull request token wording

[hiromieguchi802-lab]

Summary

• clarify that the write-token downgrade applies to forked pull request events except pull_request_target
• avoid implying that pull_request_target is subject to the same read-only adjustment

Fixes#32398.

Testing

• ran npm run lint-content -- --precommit --paths content/actions/reference/workflows-and-actions/workflow-syntax.md

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.203.193.183.173.163.153.14	fpt ghec ghes@ 3.203.193.183.173.163.153.14

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[Sharra-writes]

@hiromieguchi802-lab This looks right to me based on the issue, so I'll give it approval. We are (still) in a deploy freeze, though, so I can't merge yet. Not sure when it's going to end, or I would give you a timeframe.

[hiromieguchi802-lab]

Thanks again for the approval and for the note about the deploy freeze.

No rush from my side. If it helps once the freeze lifts, I can rebase the branch to bring it back up to date with \main\.

[saqlianmalik91-dot]

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