DOC: add some docstring

Author: jgehrcke

pandas/io/pytables.py

@@ -1821,6 +1821,14 @@ def convert(self, values, nan_rep, encoding, errors, start=None,
         Parameters
         ----------
 
+        values :
+            Expected to be passed but ignored in this implementation.
+        nan_rep :
+            Expected to be passed but ignored in this implementation.
+        encoding:
+            Expected to be passed but ignored in this implementation.
+        errors:
+            Expected to be passed but ignored in this implementation.
         start : int, optional
             Table row number: the start of the sub-selection.
         stop : int, optional