minor textual changes

Author: MBrouns

doc/source/whatsnew/v1.1.0.rst

@@ -781,7 +781,7 @@ Deprecations
 - The ``squeeze`` keyword in the ``groupby`` function is deprecated and will be removed in a future version (:issue:`32380`)
 - The ``tz`` keyword in :meth:`Period.to_timestamp` is deprecated and will be removed in a future version; use `per.to_timestamp(...).tz_localize(tz)`` instead (:issue:`34522`)
 - :meth:`DatetimeIndex.to_perioddelta` is deprecated and will be removed in a future version.  Use ``index - index.to_period(freq).to_timestamp()`` instead (:issue:`34853`)
-- the ``center`` keyword in the :meth:`DataFrame.expanding`  function is deprecated and will be removed in a future version (:issue:`20647`)
+- The ``center`` keyword in the :meth:`DataFrame.expanding`  function is deprecated and will be removed in a future version (:issue:`20647`)
 
 .. ---------------------------------------------------------------------------
 

pandas/core/window/expanding.py

@@ -61,11 +61,7 @@ class Expanding(_Rolling_and_Expanding):
     def __init__(self, obj, min_periods=1, center=None, axis=0, **kwargs):
         if center is not None:
             warnings.warn(
-                """
-                the `center` argument on `expanding` will be removed in the future.
-                Please be aware that there are issues with its current implementation,
-                and use it with caution
-                (https://github.com/pandas-dev/pandas/issues/20647)""",
+                "The `center` argument on `expanding` will be removed in the future",
                 FutureWarning,
                 stacklevel=3,
             )