docs: kdoc_item: Improve docstrings and comments

In preparation to document kernel-doc module, improve its
documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <65a7c6bb318e7a8cbf5c115903d507568099151a.1768838938.git.mchehab+huawei@kernel.org>

Author: mchehab

tools/lib/python/kdoc/kdoc_item.py

@@ -4,7 +4,16 @@
 # then pass into the output modules.
 #
 
+"""
+Data class to store a kernel-doc Item.
+"""
+
 class KdocItem:
+    """
+    A class that will, eventually, encapsulate all of the parsed data that we
+    then pass into the output modules.
+    """
+
     def __init__(self, name, fname, type, start_line, **other_stuff):
         self.name = name
         self.fname = fname
@@ -24,6 +33,9 @@ def __init__(self, name, fname, type, start_line, **other_stuff):
         self.other_stuff = other_stuff
 
     def get(self, key, default = None):
+        """
+        Get a value from optional keys.
+        """
         return self.other_stuff.get(key, default)
 
     def __getitem__(self, key):
@@ -33,10 +45,16 @@ def __getitem__(self, key):
     # Tracking of section and parameter information.
     #
     def set_sections(self, sections, start_lines):
+        """
+        Set sections and start lines.
+        """
         self.sections = sections
         self.section_start_lines = start_lines
 
     def set_params(self, names, descs, types, starts):
+        """
+        Set parameter list: names, descriptions, types and start lines.
+        """
         self.parameterlist = names
         self.parameterdescs = descs
         self.parametertypes = types