simplify lstrip and rstrip

Author: Cheukting

pandas/core/strings.py

@@ -2188,23 +2188,23 @@ def encode(self, encoding, errors="strict"):
  2 3. Cat?
  dtype: object
 
- >>> s.str.strip('123.!? \n\t')
- 0 Ant
- 1 Bee
- 2 Cat
- dtype: object
-
- >>> s.str.lstrip('123.!? \n\t')
+ >>> s.str.lstrip('123.')
  0 Ant.
  1 Bee!\n
  2 Cat?\t
  dtype: object
 
- >>> s.str.rstrip('123.!? \n\t')
+ >>> s.str.rstrip('.!? \n\t')
  0 1. Ant
  1 2. Bee
  2 3. Cat
  dtype: object
+
+ >>> s.str.strip('123.!? \n\t')
+ 0 Ant
+ 1 Bee
+ 2 Cat
+ dtype: object
  """)
 
  @Appender(_shared_docs['str_strip'] % dict(side='left and right sides',