address CI issues in isnull and notnull

Author: Lonercode

pandas/core/series.py

@@ -5135,6 +5135,11 @@ def reindex(  # type: ignore[override]
 
         Parameters
         ----------
+        index : scalar, list-like, dict-like or function, optional
+            A scalar, list-like, dict-like or functions transformations to
+            apply to that axis' values.
+        axis : {0 or 'index'}, default 0
+            The axis to rename. For `Series` this parameter is unused and defaults to 0.
         method : {{None, 'backfill'/'bfill', 'pad'/'ffill', 'nearest'}}
             Method to use for filling holes in reindexed DataFrame.
             Please note: this is only applicable to DataFrames/Series with a
@@ -6182,7 +6187,8 @@ def isna(self) -> Series:
 
     def isnull(self) -> Series:
         """
-        Series.isnull is an alias for Series.isna.
+        Series.isnull is an alias for Series.isna. 
+        
         Detect missing values.
 
         Return a boolean same-sized object indicating if the values are NA.
@@ -6323,7 +6329,8 @@ def notna(self) -> Series:
 
     def notnull(self) -> Series:
         """
-        Series.notnull is an alias for Series.notna.
+        Series.notnull is an alias for Series.notna. 
+        
         Detect existing (non-missing) values.
 
         Return a boolean same-sized object indicating if the values are not NA.