plugin: include a warning about race detector compatability in docs

[ExtraE113]

As described in #24245, the race detector isn't able to find some race conditions in plugins.
This commit adds a warning about this to the plugins documentation.

Updates #24245

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Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1:

(2 comments)

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Message from Ezra Newman:

Patch Set 3:

(3 comments)

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Message from Ian Lance Taylor:

Patch Set 3: Auto-Submit+1 Code-Review+2 Commit-Queue+1

(1 comment)

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Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-08-09T19:33:06Z","revision":"1f09f01e4deeac82a1cbcf8232ec7d49b1f5386b"}

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Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/604275 has been merged.