remove unnecessary use of Appender (#37703)

Co-authored-by: David Mrva <davidm@speechmatics.com>

Author: smartvinnetou

pandas/core/generic.py

@@ -10861,6 +10861,7 @@ def all(self, axis=0, bool_only=None, skipna=True, level=None, **kwargs):
         cls.all = all  # type: ignore[assignment]
 
         @doc(
+            NDFrame.mad,
             desc="Return the mean absolute deviation of the values "
             "over the requested axis.",
             name1=name1,
@@ -10869,7 +10870,6 @@ def all(self, axis=0, bool_only=None, skipna=True, level=None, **kwargs):
             see_also="",
             examples="",
         )
-        @Appender(NDFrame.mad.__doc__)
         def mad(self, axis=None, skipna=None, level=None):
             return NDFrame.mad(self, axis, skipna, level)