[clang] [NFC][BoundsSafety] Give `counted_by_or_null`, `sized_by`, and `sized_by_or_null` their own documentation (PR #212877)

[Dan Liew via cfe-commits]

delcypher wrote:

/cherry-pick 45271fc23fd23f83eace959285abfd580a267a5

https://github.com/llvm/llvm-project/pull/212877
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