DOC: Fix typo in shared doc for align method (pandas-dev#16665)

Author: milo0

pandas/core/generic.py

@@ -5045,7 +5045,7 @@ def ranker(data):
         return ranker(data)
 
     _shared_docs['align'] = ("""
-        Align two object on their axes with the
+        Align two objects on their axes with the
         specified join method for each axis Index
 
         Parameters