DOC: Fix a comment typo in pandas/tools/concat.py (#15956)

Author: funnycrab

pandas/tools/concat.py

@@ -278,7 +278,7 @@ def __init__(self, objs, axis=0, join='outer', join_axes=None,
                     break
 
         else:
-            # filter out the empties if we have not multi-index possibiltes
+            # filter out the empties if we have not multi-index possibilities
             # note to keep empty Series as it affect to result columns / name
             non_empties = [obj for obj in objs
                            if sum(obj.shape) > 0 or isinstance(obj, Series)]