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fix: typo in ExtractLetsConfig doc comment (#12174)

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This PR fixes a typo in `ExtractLetsConfig.merge` doc comment.

Reported on Zulip:
https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Typo.20in.20Init.2FMetaTypes.2Elean/near/568698828

🤖 Prepared with Claude Code

Co-authored-by: Claude <noreply@anthropic.com>
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Kim Morrison 2026-01-29 15:40:43 +11:00 • committed by GitHub
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src/Init/MetaTypes.lean
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@ -374,7 +374,7 @@ structure ExtractLetsConfig where
/-- If true (default: false), eliminate unused lets rather than extract them. -/
usedOnly : Bool := false
/-- If true (default: true), reuse local declarations that have syntactically equal values.
Note that even when false, the caching strategy for `extract_let`s may result in fewer extracted let bindings than expected. -/
Note that even when false, the caching strategy for `extract_lets` may result in fewer extracted let bindings than expected. -/
merge : Bool := true
/-- When merging is enabled, if true (default: true), make use of pre-existing local definitions in the local context. -/
useContext : Bool := true