Minor copy edits for readability and consistency

Removed redundant "as well".
Re-punctuated run-on sentences.
Removed periods from the ends of single-sentence list items. Added them to
the ends of multi-sentence list items.
Grammar tweaks.
Update Attendee Procedure for incident handling.md

Re-wording of the public-shaming note. Hopefully less "silence"-oriented and heavier on the "what we might get out of it" if we give the community a chance to resolve issues before they hit the internet at large.

Reconfigurations and edits very welcome!
Merge pull request #4 from pythonchelle/master

Reworded the public-shaming note. via pythonchelle
Update README.md

Updated readme
Update README.md

Forgot note
Merge remote-tracking branch 'upstream/master'
Removed ambiguity about incident reporting channel
Merge pull request #7 from pythonchelle/master

Attempt to remove ambiguity around incident reporting channels
Merge pull request #2 from kstrauser/master

Minor copy edits
Simplify formatting to correct section numbering

The third section was being numbered 1. Reading around, it appears
Markdown is bad at handling nested lists with multiple paragraphs.
Merge pull request #11 from tobych/numbering

Simplify formatting to correct section numbering