Revise paragraph (a revised #3164)
Revise paragraph (a revised #3164)

Revise text further, following suggestions in #3164 and part of the suggestions by @som-snytt. But I've kept "appear", since this paragraph documents the external behavior, not the implementation.
martijnhoekstra/scala,slothspot/scala,felixmulder/scala,scala/scala,lrytz/scala,slothspot/scala,jvican/scala,slothspot/scala,scala/scala,scala/scala,shimib/scala,lrytz/scala,felixmulder/scala,martijnhoekstra/scala,lrytz/scala,lrytz/scala,scala/scala,slothspot/scala,scala/scala,shimib/scala,martijnhoekstra/scala,martijnhoekstra/scala,jvican/scala,martijnhoekstra/scala,felixmulder/scala,lrytz/scala,martijnhoekstra/scala,jvican/scala,jvican/scala,jvican/scala,felixmulder/scala,scala/scala,jvican/scala,jvican/scala,felixmulder/scala,shimib/scala,shimib/scala,felixmulder/scala,slothspot/scala,shimib/scala,slothspot/scala,lrytz/scala,shimib/scala,slothspot/scala,felixmulder/scala