DOC: Enforce Numpy Docstring Validation for pandas.Grouper (#58273)

* fixed PR02,SA01 in docstring for pandas.Grouper

* removed method pandas.Grouper

* restored parameters for Grouper with an extra indentation

* restored parameters and fixed See Also section

* removed SA01 for pandas.Grouper

Author: tuhinsharma121

ci/code_checks.sh

@@ -153,7 +153,7 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.DatetimeTZDtype SA01" \
         -i "pandas.DatetimeTZDtype.tz SA01" \
         -i "pandas.DatetimeTZDtype.unit SA01" \
-        -i "pandas.Grouper PR02,SA01" \
+        -i "pandas.Grouper PR02" \
         -i "pandas.HDFStore.append PR01,SA01" \
         -i "pandas.HDFStore.get SA01" \
         -i "pandas.HDFStore.groups SA01" \

pandas/core/groupby/grouper.py

@@ -117,6 +117,11 @@ class Grouper:
         A TimeGrouper is returned if ``freq`` is not ``None``. Otherwise, a Grouper
         is returned.
 
+    See Also
+    --------
+    Series.groupby : Apply a function groupby to a Series.
+    DataFrame.groupby : Apply a function groupby.
+
     Examples
     --------
     ``df.groupby(pd.Grouper(key="Animal"))`` is equivalent to ``df.groupby('Animal')``