cmd/go/internal/cache: fix GODEBUG name in comments

[alvinjaison]

The comments reference GODEBUG=goverifycache=1 but the actual
setting name is gocacheverify (as used in the code, tests, and
documentation throughout the repository).

This typo was introduced in CL 558301a when the Cache interface
was abstracted, and the word order was accidentally flipped in
three comment locations.

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Patch Set 1:

(1 comment)

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Message from Sean Liao:

Patch Set 1:

(1 comment)

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Message from Alvin Jaison:

Patch Set 2:

(2 comments)

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Message from Sean Liao:

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

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2026-07-26T20:41:16Z","revision":"1106a362f415c8ac768904da8e0e5bb61bc75f76"}

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Message from Sean Liao:

Patch Set 2: -Commit-Queue

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Patch Set 2:

This CL has passed the run

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Patch Set 2: LUCI-TryBot-Result+1

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Message from Cherry Mui:

Patch Set 2: Code-Review+1

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