[ast matcher][NFC] fix typo in release note

Author: HerrCai0907

clang/docs/ReleaseNotes.rst

@@ -501,7 +501,7 @@ AST Matchers
 - Fixed an issue with the `hasName` and `hasAnyName` matcher when matching
   inline namespaces with an enclosing namespace of the same name.
 
-- Fixed an ordering issue with the `hasOperands` matcher occuring when setting a
+- Fixed an ordering issue with the `hasOperands` matcher occurring when setting a
   binding in the first matcher and using it in the second matcher.
 
 clang-format