[css-text] Typos

I found a few typos in CSS Text
http://dev.w3.org/csswg/css-text/

§4
  s/seqence/sequence/

§5.2 (in Example 6)
  s/&#pxFB90;/ﮐ/

§9.2
  s/hangeable/hangable/

§9.3
  s/irrelevent/irrelevant/

§Changes
  s/grammer/grammar/


Regards,

Shinyu Murakami
Antenna House