fix function name in tabnanny documentation (GH-759)

Doc/library/tabnanny.rst

@@ -48,14 +48,14 @@ described below.
 
 .. exception:: NannyNag
 
-   Raised by :func:`tokeneater` if detecting an ambiguous indent. Captured and
+   Raised by :func:`process_tokens` if detecting an ambiguous indent. Captured and
    handled in :func:`check`.
 
 
-.. function:: tokeneater(type, token, start, end, line)
+.. function:: process_tokens(tokens)
 
-   This function is used by :func:`check` as a callback parameter to the function
-   :func:`tokenize.tokenize`.
+   This function is used by :func:`check` to process tokens generated by the
+   :mod:`tokenize` module.
 
 .. XXX document errprint, format_witnesses, Whitespace, check_equal, indents,
    reset_globals

Lib/tabnanny.py

@@ -59,7 +59,7 @@ def main():
 
 class NannyNag(Exception):
     """
-    Raised by tokeneater() if detecting an ambiguous indent.
+    Raised by process_tokens() if detecting an ambiguous indent.
     Captured and handled in check().
     """
     def __init__(self, lineno, msg, line):