[Clang] [NFC] Remove trailing whitespace in release notes (#111506)

Author: Sirraide

clang/docs/ReleaseNotes.rst

@@ -644,8 +644,8 @@ New features
   if class of allocation and deallocation function mismatches.
   `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#unix-mismatcheddeallocator-c-c>`__.
 
-- Function effects, e.g. the ``nonblocking`` and ``nonallocating`` "performance constraint" 
-  attributes, are now verified. For example, for functions declared with the ``nonblocking`` 
+- Function effects, e.g. the ``nonblocking`` and ``nonallocating`` "performance constraint"
+  attributes, are now verified. For example, for functions declared with the ``nonblocking``
   attribute, the compiler can generate warnings about the use of any language features, or calls to
   other functions, which may block.