[docs] Fix Namespace documentation (#17324)

Authored by: doe1080

yt_dlp/YoutubeDL.py

@@ -672,7 +672,6 @@ class YoutubeDL:
         except Exception as e:
             self.write_debug(f'Failed to enable VT mode: {e}')
 
-        # hehe "immutable" namespace
         self._out_files.console = next(filter(supports_terminal_sequences, (sys.stderr, sys.stdout)), None)
 
         if self.params.get('no_color'):

yt_dlp/utils/_utils.py

@@ -5083,7 +5083,7 @@ class function_with_repr:
 
 
 class Namespace(types.SimpleNamespace):
-    """Immutable namespace"""
+    """SimpleNamespace iterable over attribute values"""
 
     def __iter__(self):
         return iter(self.__dict__.values())