Apply corrections

Used message.C directly instead of slicing again, improved feature notes
and removed unecessary output from locally run pre-commit pylint hook.
It was kept for the manual stage since that is run on Github and needs
it to annotate code on PRs.

Author: crazybolillo

.pre-commit-config.yaml

@@ -77,8 +77,7 @@ repos:
         entry: pylint
         language: system
         types: [python]
-        args:
-          ["-rn", "-sn", "--rcfile=pylintrc", "--fail-on=I", "--output-format=github"]
+        args: ["-rn", "-sn", "--rcfile=pylintrc", "--fail-on=I"]
         exclude: tests(/\w*)*/functional/|tests/input|tests(/\w*)*data/|doc/
       # We define an additional manual step to allow running pylint with a spelling
       # checker in CI.

doc/whatsnew/fragments/9443.feature

@@ -1,4 +1,4 @@
-A new `github` reporter has been added. This reporter automatically annotates code on GitHub's user interface
-with the messages found during linting. Use it with `pylint --output-format=github`.
+A new `github` reporter has been added. This reporter  returns the output of `pylint` in a format that
+Github can use to automatically annotate code. Use it with `pylint --output-format=github` on your Github Workflows.
 
 Closes #9443.

pylint/reporters/text.py

@@ -276,7 +276,7 @@ def write_message(self, msg: Message) -> None:
         for key in ("end_line", "end_column"):
             self_dict[key] = self_dict[key] or ""
 
-        self_dict["category"] = self.category_map.get(msg.msg_id[:1]) or "error"
+        self_dict["category"] = self.category_map.get(msg.C) or "error"
         self.writeln(self._fixed_template.format(**self_dict))