DOC: Updated aggregate docstring (pandas-dev#35042)

* DOC: Updated aggregate docstring

* Doc: updated aggregate docstring

* Update pandas/core/generic.py

Co-authored-by: Marco Gorelli <33491632+MarcoGorelli@users.noreply.github.com>

* Update generic.py

* Update generic.py

* Revert "Update generic.py"

This reverts commit 15ecaf7.

* Revert "Revert "Update generic.py""

This reverts commit cc231c8.

* Updated docstring of agg

* Trailing whitespace removed

* DOC: Updated docstring of agg

* Update generic.py

* Updated Docstring

Co-authored-by: Marco Gorelli <33491632+MarcoGorelli@users.noreply.github.com>

pandas/core/generic.py

@@ -5169,6 +5169,9 @@ def pipe(self, func, *args, **kwargs):
         -----
         `agg` is an alias for `aggregate`. Use the alias.
 
+        In pandas, agg, as most operations just ignores the missing values,
+        and returns the operation only considering the values that are present.
+
         A passed user-defined-function will be passed a Series for evaluation.
         {examples}"""
     )