docs: kdoc: improve description of MsgFormatter

The description there is quite vague. Make it clearer.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <94269990e2d665bec08a1b6f4d28d84939cb9d83.1768823489.git.mchehab+huawei@kernel.org>

Author: mchehab

tools/docs/kernel-doc

@@ -182,7 +182,10 @@ return 0 if there are issues at kernel-doc markups;
 """
 
 class MsgFormatter(logging.Formatter):
-    """Helper class to format warnings in a similar way to kernel-doc.pl."""
+    """
+    Helper class to capitalize errors and warnings, the same way
+    the venerable (now retired) kernel-doc.pl used to do.
+    """
 
     def format(self, record):
         record.levelname = record.levelname.capitalize()