DOC: Fix #33451 (#34955)

Author: marinomaria

pandas/core/frame.py

@@ -4006,7 +4006,8 @@ def drop(
         level : int or level name, optional
             For MultiIndex, level from which the labels will be removed.
         inplace : bool, default False
-            If True, do operation inplace and return None.
+            If False, return a copy. Otherwise, do operation
+            inplace and return None.
         errors : {'ignore', 'raise'}, default 'raise'
             If 'ignore', suppress error and only existing labels are
             dropped.