Add comments to clarify why we ignore a couple of vnu's errors.
Add comments to clarify why we ignore a couple of vnu's errors.

* "autocomplete" attribute errors
* "legend" is not allowed as child of "div"

Hemphill/bootstrap-docs,peterblazejewicz/bootstrap,gijsbotje/bootstrap,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,gijsbotje/bootstrap,twbs/bootstrap,zalog/bootstrap,SweetProcess/bootstrap,tagliala/bootstrap,janseliger/bootstrap,creativewebjp/bootstrap,Lyricalz/bootstrap,zalog/bootstrap,9-chirno/chirno,seanwu99/bootstrap,joblocal/bootstrap,Hemphill/bootstrap-docs,Lyricalz/bootstrap,GerHobbelt/bootstrap,supergibbs/bootstrap,supergibbs/bootstrap,vsn4ik/bootstrap,joblocal/bootstrap,creativewebjp/bootstrap,janseliger/bootstrap,Lyricalz/bootstrap,bardiharborow/bootstrap,GerHobbelt/bootstrap,yuyokk/bootstrap,Hemphill/bootstrap-docs,tagliala/bootstrap,seanwu99/bootstrap,stanwmusic/bootstrap,bardiharborow/bootstrap,nice-fungal/bootstrap,fschumann1211/bootstrap,creativewebjp/bootstrap,nice-fungal/bootstrap,SweetProcess/bootstrap,yuyokk/bootstrap,bardiharborow/bootstrap,inway/bootstrap,peterblazejewicz/bootstrap,tjkohli/bootstrap,bardiharborow/bootstrap,seanwu99/bootstrap,zalog/bootstrap,gijsbotje/bootstrap,coliff/bootstrap,Hemphill/bootstrap-docs,stanwmusic/bootstrap,gijsbotje/bootstrap,supergibbs/bootstrap,kvlsrg/bootstrap,twbs/bootstrap,9-chirno/chirno,yuyokk/bootstrap,janseliger/bootstrap,9-chirno/chirno,nice-fungal/bootstrap,joblocal/bootstrap,SweetProcess/bootstrap,vsn4ik/bootstrap,stanwmusic/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,bootstrapbrasil/bootstrap,yuyokk/bootstrap,kvlsrg/bootstrap,fschumann1211/bootstrap,SweetProcess/bootstrap,m5o/bootstrap,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,kvlsrg/bootstrap,joblocal/bootstrap,tjkohli/bootstrap,creativewebjp/bootstrap,coliff/bootstrap,peterblazejewicz/bootstrap,janseliger/bootstrap,tagliala/bootstrap,fschumann1211/bootstrap,fschumann1211/bootstrap,stanwmusic/bootstrap,m5o/bootstrap,9-chirno/chirno,supergibbs/bootstrap,seanwu99/bootstrap,inway/bootstrap,Lyricalz/bootstrap