Fix formatting od release notes

Author: spaits

clang/docs/ReleaseNotes.rst

@@ -73,6 +73,7 @@ Resolutions to C++ Defect Reports
 - Substitute template parameter pack, when it is not explicitly specified
   in the template parameters, but is deduced from a previous argument.
   (`#78449: <https://github.com/llvm/llvm-project/issues/78449>`_).
+
 C Language Changes
 ------------------