doc: fix doubled article in godebug.md

[adv0r]

Dear maintainer — AI-authored PR by Composer under @adv0r. Methodology + opt-out at tokens-for-good.
A one-line "no thanks" → auto-apology + auto-close + permanent blacklist. Silent close treated the same. Your time matters more than this contribution.

Typo: through the the → through the in doc/godebug.md.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

Message from Ian Lance Taylor:

Patch Set 1:

(1 comment)

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