Docs: Update MenuBar docstrings and remove unused comments

- Updated docstrings for __init__ and update_ui_for_update to reflect
  recent changes in arguments and logic, improving code documentation.
- Removed an unused commented-out line in the __init__ method signature.

menu_bar.py

@@ -24,7 +24,6 @@ class MenuBar(ttk.Frame):
     def __init__(
         self,
         container: ttk.Frame,
-        # Should have a .get_icon(str) -> PhotoImage method
         image_manager: 'Any',
         tooltip_state: 'BooleanVar',
         on_theme_toggle: 'Callable[[], None]',
@@ -39,14 +38,14 @@ class MenuBar(ttk.Frame):
         """
         Initializes the MenuBar.
 
-        Args:
+                Args:
             container: The parent widget.
             image_manager: An object with a `get_icon` method to retrieve icons.
             tooltip_state: A tkinter BooleanVar to control tooltip visibility.
             on_theme_toggle: Callback function to toggle the application's theme.
             toggle_log_window: Callback function to show/hide the log window.
             app_version: The current version string of the application.
-            msg_config: Project-specific messages. Must have STR and TTIP dicts.
+            msg_config: Project-specific messages and tooltips. Must have STR and TTIP dicts.
             about_icon_path: Filesystem path to the icon for the 'About' dialog.
             about_url: URL for the project's repository or website.
             gitea_api_url: The Gitea API URL for update checks.
@@ -215,6 +214,7 @@ class MenuBar(ttk.Frame):
             new_version: The new version string if an update is available,
                          "DISABLED" if updates are off, "ERROR" if an error occurred,
                          or None if no update is available.
+                         This string also serves as the update status.
         """
         self.update_status = new_version
         self.animated_icon_frame.grid_remove()