[PATCH] D88446: docs: add documentation describing API Notes

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd created this revision.
compnerd added reviewers: MForster, gribozavr2, rsmith.
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API Notes are a feature which allows annotation of headers by an
auxiliary file that contains metadata for declarations pertaining to the
associated module.  This enables adding attributes to declarations
without requiring modification of the headers, enabling finer grained
control for library headers for consumers without having to modify
external headers.

Based on the work from https://github.com/llvm/llvm-project-staging/commit/d238492fd3a82160955d0642b85d8ce620fa3258


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88446

Files:
  clang/docs/APINotes.rst
  clang/test/APINotes/Inputs/Frameworks/SomeKit.framework/Headers/SomeKit.apinotes
  clang/test/APINotes/Inputs/Frameworks/SomeKit.framework/Headers/SomeKit.h
  clang/test/APINotes/Inputs/Frameworks/SomeKit.framework/Headers/SomeKitExplicitNullability.h
  clang/test/APINotes/Inputs/Frameworks/SomeKit.framework/Headers/SomeKit_private.apinotes

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