[clang-tidy] Correct typo in ReleaseNotes.rst (#104674)

Author: mikecrowe

clang-tools-extra/docs/ReleaseNotes.rst

@@ -106,7 +106,7 @@ Changes in existing checks
 
 - Improved :doc:`readability-redundant-smartptr-get
   <clang-tidy/checks/readability/redundant-smartptr-get>` check to
-  remove `->`, when reduntant `get()` is removed.
+  remove `->`, when redundant `get()` is removed.
 
 Removed checks
 ^^^^^^^^^^^^^^