[clang-tidy][NFC] fix typo in release note

Author: HerrCai0907

clang-tools-extra/docs/ReleaseNotes.rst

@@ -123,7 +123,7 @@ Changes in existing checks
   <clang-tidy/checks/modernize/use-std-print>` check to support replacing
   member function calls too.
 
-- Improved :doc:`readablility-implicit-bool-conversion
+- Improved :doc:`readability-implicit-bool-conversion
   <clang-tidy/checks/readability/implicit-bool-conversion>` check
   by adding the option `UseUpperCaseLiteralSuffix` to select the
   case of the literal suffix in fixes.