Revert "Make release note a bit more detailed"

Author: localspook

clang-tools-extra/docs/ReleaseNotes.rst

@@ -211,9 +211,7 @@ New checks
 - New :doc:`readability-redundant-typename
  <clang-tidy/checks/readability/redundant-typename>` check.
 
- Finds redundant uses of the ``typename`` keyword. Can be used
- to modernize code to take advantage of the C++20 rules that make
- ``typename`` redundant in many cases where it was mandatory before.
+ Finds redundant uses of the ``typename`` keyword.
 
 New check aliases
 ^^^^^^^^^^^^^^^^^