From 02d16153100634115613e2494f0aa9efec4229c8 Mon Sep 17 00:00:00 2001
From: Micael Jarniac <micael@jarniac.com>
Date: Sun, 17 Jan 2021 12:59:39 -0300
Subject: [PATCH] Backport PR #39139: BUG: Placeholders not being filled on
 docstrings

---
 pandas/core/generic.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 2f7e78d696d7c..8da3bae190f82 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -10889,8 +10889,10 @@ def all(self, axis=0, bool_only=None, skipna=True, level=None, **kwargs):
         # [assignment]
         cls.all = all  # type: ignore[assignment]
 
+        # error: Argument 1 to "doc" has incompatible type "Optional[str]"; expected
+        # "Union[str, Callable[..., Any]]"
         @doc(
-            NDFrame.mad,
+            NDFrame.mad.__doc__,  # type: ignore[arg-type]
             desc="Return the mean absolute deviation of the values "
             "over the requested axis.",
             name1=name1,