[clang-tidy] Improved release notes

Author: vbvictor

clang-tools-extra/docs/ReleaseNotes.rst

@@ -144,8 +144,8 @@ Changes in existing checks
 
 - Improved :doc:`bugprone-string-constructor
   <clang-tidy/checks/bugprone/string-constructor>` check to find suspicious
-  calls of string constructor with char pointer, start position and length
-  parameters.
+  calls of ``std::string`` constructor with char pointer, start position and
+  length parameters.
 
 - Improved :doc:`bugprone-throw-keyword-missing
   <clang-tidy/checks/bugprone/throw-keyword-missing>` by fixing a false positive