[clang-tidy] fixed pr comments

Author: vbvictor

clang-tools-extra/docs/clang-tidy/checks/misc/const-correctness.rst

@@ -208,4 +208,4 @@ Options
   and `reference`. If a name in the list contains the sequence `::`, it is
   matched against the qualified type name (i.e. ``namespace::Type``),
   otherwise it is matched against only the type name (i.e. ``Type``).
-  Default is empty.
+  Default is empty string.