Added Version added tag and removed unnecessary parameter

Author: hendrikmakait

pandas/core/generic.py

@@ -804,6 +804,8 @@ def _set_axis_name(self, name, axis=0, inplace=False):
         inplace : bool
             whether to modify `self` directly or return a copy
 
+            .. versionadded: 0.20.2
+
         Returns
         -------
         renamed : type of caller or None if inplace=True
@@ -834,7 +836,7 @@ def _set_axis_name(self, name, axis=0, inplace=False):
         idx = self._get_axis(axis).set_names(name)
 
         inplace = validate_bool_kwarg(inplace, 'inplace')
-        renamed = self if inplace else self.copy(deep=True)
+        renamed = self if inplace else self.copy()
         renamed.set_axis(axis, idx)
         if not inplace:
             return renamed