DOC: fix SA04 errors flagged by validate_docstrings.py and add SA04 t… (#46652)

* DOC: fix SA04 errors flagged by validate_docstrings.py and add SA04 to code_checks.sh

* DOC: apply feedback

* DOC: change Series/Dataframe to just Dataframe

* DOC: move to one line

Co-authored-by: Derek Sharp <[email protected]>

Author: dataxerik

ci/code_checks.sh

@@ -78,8 +78,8 @@ fi
 ### DOCSTRINGS ###
 if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
 
-    MSG='Validate docstrings (EX04, GL01, GL02, GL03, GL04, GL05, GL06, GL07, GL09, GL10, PR03, PR04, PR05, PR06, PR08, PR09, PR10, RT01, RT04, RT05, SA02, SA03, SS01, SS02, SS03, SS04, SS05)' ; echo $MSG
-    $BASE_DIR/scripts/validate_docstrings.py --format=actions --errors=EX04,GL01,GL02,GL03,GL04,GL05,GL06,GL07,GL09,GL10,PR03,PR04,PR05,PR06,PR08,PR09,PR10,RT01,RT04,RT05,SA02,SA03,SS01,SS02,SS03,SS04,SS05
+    MSG='Validate docstrings (EX04, GL01, GL02, GL03, GL04, GL05, GL06, GL07, GL09, GL10, PR03, PR04, PR05, PR06, PR08, PR09, PR10, RT01, RT04, RT05, SA02, SA03, SA04, SS01, SS02, SS03, SS04, SS05)' ; echo $MSG
+    $BASE_DIR/scripts/validate_docstrings.py --format=actions --errors=EX04,GL01,GL02,GL03,GL04,GL05,GL06,GL07,GL09,GL10,PR03,PR04,PR05,PR06,PR08,PR09,PR10,RT01,RT04,RT05,SA02,SA03,SA04,SS01,SS02,SS03,SS04,SS05
     RET=$(($RET + $?)) ; echo $MSG "DONE"
 
 fi

pandas/core/indexes/base.py

@@ -4371,8 +4371,8 @@ def reindex(
 
         See Also
         --------
-        Series.reindex
-        DataFrame.reindex
+        Series.reindex : Conform Series to new index with optional filling logic.
+        DataFrame.reindex : Conform DataFrame to new index with optional filling logic.
 
         Examples
         --------