DOC: fix documentation for pandas.Series.transform (pandas-dev#35885)

Author: onshek

pandas/core/generic.py

@@ -10703,7 +10703,7 @@ def transform(self, func, *args, **kwargs):
 
  - function
  - string function name
- - list of functions and/or function names, e.g. ``[np.exp. 'sqrt']``
+ - list of functions and/or function names, e.g. ``[np.exp, 'sqrt']``
  - dict of axis labels -> functions, function names or list of such.
  {axis}
  *args