[NFC] Remove trailing white spaces in clang/docs/ReleaseNotes.rst

Author: shiltian

clang/docs/ReleaseNotes.rst

@@ -310,7 +310,7 @@ Resolutions to C++ Defect Reports
   by default.
   (`CWG2521: User-defined literals and reserved identifiers <https://cplusplus.github.io/CWG/issues/2521.html>`_).
 
-- Fix name lookup for a dependent base class that is the current instantiation.  
+- Fix name lookup for a dependent base class that is the current instantiation.
   (`CWG591: When a dependent base class is the current instantiation <https://cplusplus.github.io/CWG/issues/591.html>`_).
 
 C Language Changes