[libcxxabi] NFC: Fix trivial typos in comments

Reviewers: EricWF, mclow.lists, Jim

Reviewed By: Jim

Subscribers: mgorny, christof, ldionne, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D72151

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Cr-Mirrored-Commit: dac7cda3a84e5405f7dd915f09c336d20dfdf00d
2 files changed