Update emoji_article.md

GW, 
- I made a few little edits in yr prose
- There should be 3-4 paragraphs under each heading for symmetry and pacing I think
- added a section heading called "Syntax without Semantics" 
- slashed and burned the "Blank Text" section, put big chunks of it in a new "Deletes" section at bottom just so you can see what I deleted.
- small note, what is the exact number of human faces you mention
- I think there could be 1-2 more headings, possibly make the "convergence" shorter