Changes as requested in #47058 (#47119)

* Changes as requested in #47058

This is my first open-source contribution. Please let me know if there are any mistakes, will rectify them

* required changes as per #47058

Please let me know if have to change anything.

* changes to doc as per #47058

If any more changes required please let me know.

* Changes to doc as per #47058

Let me know if there are any changes

* Update pandas/core/generic.py

* Update pandas/core/generic.py

* Update pandas/core/generic.py

Co-authored-by: Matthew Roeschke <[email protected]>

Author: MaruthiKo

pandas/core/generic.py

@@ -3349,8 +3349,9 @@ def to_csv(
             sequence should be given if the object uses MultiIndex. If
             False do not print fields for index names. Use index_label=False
             for easier importing in R.
-        mode : str
-            Python write mode, default 'w'.
+        mode : str, default 'w'
+            Python write mode. The available write modes are the same as
+            :py:func:`open`.
         encoding : str, optional
             A string representing the encoding to use in the output file,
             defaults to 'utf-8'. `encoding` is not supported if `path_or_buf`