documents inline text formatting changes

- documents asciidoctor/asciidoctor#225
- documents asciidoctor/asciidoctor#714
- documents asciidoctor/asciidoctor#715
- documents asciidoctor/asciidoctor#717
- documents asciidoctor/asciidoctor#718
- documents asciidoctor/asciidoctor#1046