Minor form enctype errors

http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html

"multpart/form-data" is mentioned several times; presumably that should 
be "multipart/form-data" instead.

Also, after enumerating the three enctype states, it says "The enctype 
of an element is one of those four states."

-- 
Philip Taylor
pjt47@cam.ac.uk