runtime/maps: fix typo in group.go comment (H1 -> H2)

[acdefgg]

Fixes a typo to correctly describe the hash bits of the control word.

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Patch Set 1:

(1 comment)

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Message from Keith Randall:

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

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Message from Keith Randall:

Patch Set 3: Code-Review+1

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Message from Ian Lance Taylor:

Patch Set 3: Code-Review+1

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Message from Artyom Litovets:

Patch Set 3:

(1 comment)

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Message from Keith Randall:

Patch Set 3: Commit-Queue+1

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Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-02-16T14:01:02Z","revision":"ac2ce736b9e810136a3cf4335a8f505af38bd888"}

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This PR is being closed because golang.org/cl/649416 has been merged.