Incorporate comments, reduce wordiness
Incorporate comments, reduce wordiness

* Cut etiquette section
* Include Code of Conduct link in Review Guidelines section
* Change wording aroung LGTM and additional reviews

vl4ds/scala-lang,jeantil/scala-lang,vl4ds/scala-lang,andy1138/scala-lang,boldradius/scala-lang,vl4ds/scala-lang,boldradius/scala-lang,andy1138/scala-lang,jeantil/scala-lang,vl4ds/scala-lang,boldradius/scala-lang,andy1138/scala-lang,boldradius/scala-lang,andy1138/scala-lang,jeantil/scala-lang,jeantil/scala-lang