The French Manual
http://dev.mysql.com/doc/refman/5.0/fr/grant.html
gives the syntaxe for "grant" and "revoke".
In the first line, the correct syntaxe is given:
REVOKE ALL PRIVILEGES, GRANT OPTION FROM user [, user] ...
But later in the same page, a wrong syntaxe is given:
REVOKE ALL PRIVILEGES,GRANT FROM user_name [, user_name ...]
["OPTION" is missing]
saying that this syntax exists since MySQL 4.1.2.
I doubt that this syntax has changed since 4.1.2 (so this statement would be false twice), but I'm sure it does not work today.
Reference:
http://dev.mysql.com/doc/refman/5.0/en/revoke.html
REVOKE ALL PRIVILEGES, GRANT OPTION FROM user [, user] ...
I don't know where to make bug reports with respect to translation of documentation.