Various copyedits.
Various copyedits.

* Fix typos, names, markup, and grammatical errors, including run-on
  sentences.
* Try to enforce prevailing document conventions more consistently
  around the typesetting of field names, literal values, and ending
  list items and documentation fragments with a period even when
  they're not sentences.
* A couple of wording changes suggested to improve clarity.

foreveremain/common-workflow-language,StarvingMarvin/common-workflow-language,foreveremain/common-workflow-language,jeremiahsavage/cwltool,brainstorm/common-workflow-language,hmenager/common-workflow-language,SciDAP/cwltool,guillermo-carrasco/common-workflow-language,satra/common-workflow-language,hmenager/common-workflow-language,common-workflow-language/common-workflow-language,chapmanb/cwltool,curoverse/common-workflow-language,chapmanb/cwltool,mr-c/common-workflow-language,mr-c/common-workflow-language,foreveremain/common-workflow-language,dleehr/common-workflow-language,common-workflow-language/cwltool,slnovak/common-workflow-language,ohsu-computational-biology/common-workflow-language,brainstorm/common-workflow-language,dleehr/cwltool,common-workflow-language/common-workflow-language,dleehr/cwltool,dleehr/common-workflow-language,SciDAP/cwltool,jeremiahsavage/cwltool,StarvingMarvin/common-workflow-language,slnovak/common-workflow-language,stain/common-workflow-language,hmenager/common-workflow-language,stain/common-workflow-language,common-workflow-language/cwltool,dleehr/common-workflow-language,SciDAP/cwltool,dleehr/common-workflow-language,StarvingMarvin/common-workflow-language,SciDAP/cwltool,stain/common-workflow-language,dleehr/cwltool,satra/common-workflow-language,brainstorm/common-workflow-language,chapmanb/cwltool,common-workflow-language/common-workflow-language,jeremiahsavage/cwltool,curoverse/common-workflow-language,satra/common-workflow-language,StarvingMarvin/common-workflow-language,stain/common-workflow-language,common-workflow-language/common-workflow-language,slnovak/common-workflow-language,chapmanb/cwltool,guillermo-carrasco/common-workflow-language,hmenager/common-workflow-language,jeremiahsavage/cwltool,common-workflow-language/cwltool,ohsu-computational-biology/common-workflow-language,guillermo-carrasco/common-workflow-language,mr-c/common-workflow-language,dleehr/cwltool,ohsu-computational-biology/common-workflow-language