DOC: fix SA05 errors in docstring for pandas.core.groupby.DataFrameGr…

…oupBy - first, last (#57414)

* Fixing SA05 for first and last core.groupby.DataFrameGroupBy

* remove function from code_checks

ci/code_checks.sh

@@ -1543,8 +1543,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
 
     MSG='Partially validate docstrings (SA05)' ;  echo $MSG
     $BASE_DIR/scripts/validate_docstrings.py --format=actions --errors=SA05 --ignore_functions \
-        pandas.core.groupby.DataFrameGroupBy.first\
-        pandas.core.groupby.DataFrameGroupBy.last\
         pandas.core.groupby.SeriesGroupBy.first\
         pandas.core.groupby.SeriesGroupBy.last\
         pandas.core.resample.Resampler.first\

pandas/core/groupby/groupby.py

@@ -3219,9 +3219,9 @@ def first(
         --------
         DataFrame.groupby : Apply a function groupby to each row or column of a
             DataFrame.
-        pandas.core.groupby.DataFrameGroupBy.last : Compute the last non-null entry
+        core.groupby.DataFrameGroupBy.last : Compute the last non-null entry
             of each column.
-        pandas.core.groupby.DataFrameGroupBy.nth : Take the nth row from each group.
+        core.groupby.DataFrameGroupBy.nth : Take the nth row from each group.
 
         Examples
         --------
@@ -3306,9 +3306,9 @@ def last(
         --------
         DataFrame.groupby : Apply a function groupby to each row or column of a
             DataFrame.
-        pandas.core.groupby.DataFrameGroupBy.first : Compute the first non-null entry
+        core.groupby.DataFrameGroupBy.first : Compute the first non-null entry
             of each column.
-        pandas.core.groupby.DataFrameGroupBy.nth : Take the nth row from each group.
+        core.groupby.DataFrameGroupBy.nth : Take the nth row from each group.
 
         Examples
         --------