Fix a typo in the note name in comments
This is `subsititution` to `substitution`, plus one instance of the note that I missed. Test Plan: docufix Reviewers: simonpj, bgamari, austin, goldfire Reviewed By: simonpj, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1856 GHC Trac Issues: #11371
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