cmd/compile: fix doc word

[willfaught]

"using" -> "uses"

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Message from Keith Randall:

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":"2025-09-19T23:10:26Z","revision":"4dedd136c314689ec3ee53914cb00dc25855a7ae"}

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Patch Set 1: Code-Review+1

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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/705515 has been merged.