fix sec_simplecheck section markup
fix typos in testing sec
fix asciidoc warnings from callouts and incorrect WARNING spec
Merge pull request #342 from mmullis/fix-testing-typos

fix typos in testing section
Merge pull request #343 from mmullis/fix-asciidoc-warnings

fix asciidoc warnings from callouts and incorrect WARNING spec
Merge pull request #341 from mmullis/fix-simplecheck-sec

Fix sec_simplecheck section markup