[selectors4] list of issues spotted in the draft

Here is a list of things I spotted while reading the draft, they might be
issues:

1. Under selectors overview section, E:current(s doesn't have a closing tag,
shouldn't it be E:current(s)?

2. There isn't detailed description for E:current(s

3.  E:nth-match(n ofselector
<http://www.w3.org/TR/selectors4/#selector>) repeated
twice under selectors overview section

4. under *13.3. ‘:nth-last-column()’ pseudo-class*, the description starts
with :nth-column(an+b), shouldn't it be  :nth-last-column(an+b) ? And the
whole paragraph sounds a bit confusing,

Cheers
Shi

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*Shi Chuan **Web Developer*

Twitter: @shichuan | Skype: shichuanr
shichuanr@gmail.com | www.blog.highub.com