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dad7313f7e8c36c35fc213ce5110100595f90990 by Andy Getzendanner <durandal@google.com>:

Fix log_severity.h header guard to match path.

PiperOrigin-RevId: 334439123

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8a58aa0f4171219d38fb49a2e008e249f86de4cb by Abseil Team <absl-team@google.com>:

Minor comment cleanup

PiperOrigin-RevId: 334409054

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a1bc324e53c358b874f99b3f5624658fff99453e by Evan Brown <ezb@google.com>:

Cleanup in btree.h:
- Combine internal_locate_impls and update comments.
- Avoid use of auto with SearchResult.
- Change one iterator reference to be stored by value (copy is cheap).

PiperOrigin-RevId: 334396951
GitOrigin-RevId: dad7313f7e8c36c35fc213ce5110100595f90990
Change-Id: I79862795abd3169587f5bafe0e5369bdde90c1e1