Fix a nano-typo in an `invariant` message
Fix a nano-typo in an `invariant` message

Summary: Depends on D3190225.

Reviewed By: yuzhi, kassens

Differential Revision: D3192950

fb-gh-sync-id: a4bec7da434c5ba6bea353fe02710da1e5004834
fbshipit-source-id: a4bec7da434c5ba6bea353fe02710da1e5004834

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