Markdown style for Exercism (#1901)
Markdown style for Exercism (#1901)

This addresses:

* single sentence per line
* minor formatting changes
* minor tyopgraphical fixes

Closes: #1900
Message-Id: <22ee22f5e5a8f561e1eaea5f3b0013f0b323c71e@gmail.com>
jmluy/x-common,exercism/x-common,jmluy/x-common,jmluy/x-common,exercism/x-common