consistent docstring (#22066)

Author: minggli

pandas/core/frame.py

@@ -1750,9 +1750,9 @@ def to_csv(self, path_or_buf=None, sep=",", na_rep='', float_format=None,
         encoding : string, optional
             A string representing the encoding to use in the output file,
             defaults to 'ascii' on Python 2 and 'utf-8' on Python 3.
-        compression : {'infer', 'gzip', 'bz2', 'xz', None}, default None
+        compression : {'infer', 'gzip', 'bz2', 'zip', 'xz', None}, default None
             If 'infer' and `path_or_buf` is path-like, then detect compression
-            from the following extensions: '.gz', '.bz2' or '.xz'
+            from the following extensions: '.gz', '.bz2', '.zip' or '.xz'
             (otherwise no compression).
         line_terminator : string, default ``'\n'``
             The newline character or character sequence to use in the output

pandas/core/generic.py

@@ -1999,7 +1999,7 @@ def to_json(self, path_or_buf=None, orient=None, date_format=None,
 
             .. versionadded:: 0.19.0
 
-        compression : {'infer', 'gzip', 'bz2', 'xz', None}, default None
+        compression : {'infer', 'gzip', 'bz2', 'zip', 'xz', None}, default None
             A string representing the compression to use in the output file,
             only used when the first argument is a filename.