context: update doc comment to link to context interface

[ALX99]

Linking to the Context interface in the WithCancel doc comment makes
it more consistent with the WithDeadline and WithTimeout doc comments.

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Message from Dmitri Shuralyov:

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

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Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-02-17T04:48:07Z","revision":"25f9df2b67a3b63747c453d51e23dec2778b3bd6"}

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Message from Dmitri Shuralyov:

Patch Set 1: Code-Review+1

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Message from Dmitri Shuralyov:

Patch Set 1: -Commit-Queue

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Patch Set 1: LUCI-TryBot-Result+1

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This PR is being closed because golang.org/cl/564996 has been merged.