[APINotes][NFC] Fix typos and header comment errors (#183811)

## Description

Fix minor typos and incorrect comments in the APINotes subsystem (No
functional code is modified)

## Changes Made

- **`APINotesReader.h`** — Fixed `member buffer` → `memory buffer` in
the `Create()` doc comment (`Create()` takes a `llvm::MemoryBuffer`)
- **`APINotesFormat.h`** — Corrected the file header comment which
incorrectly referred to `APINotesWriter.h` instead of `APINotesFormat.h`
- **`APINotesYAMLCompiler.cpp`** — Fixed `it's` → `its` (possessive, not
a contraction)
- **`SemaAPINotes.cpp`** — Fixed `collection` → `collecting` and added a
missing `to` in `defer to the client to select`

## Motivation

First contribution to LLVM, aimed at getting familiar with the
contributing workflow.
4 files changed
tree: b971c1513333b824bad75902e3d6b51b32799668
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
README.md

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