Fix typo in token.rst documentation.

Corrected a minor typo in the description of the `NAME` token. Changed "an `NAME` tokens" to "as `NAME` tokens" for clarity and accuracy.

Author: lazorikv

Doc/library/token.rst

@@ -51,7 +51,7 @@ The token constants are:
 .. data:: NAME
 
    Token value that indicates an :ref:`identifier <identifiers>`.
-   Note that keywords are also initially tokenized an ``NAME`` tokens.
+   Note that keywords are also initially tokenized as ``NAME`` tokens.
 
 .. data:: NUMBER