General editing

Use definition lists where appropriate
http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#definition-lists

Use semantic linebreaks for readable diffs.
http://rhodesmill.org/brandon/2012/one-sentence-per-line/

Small formulation edits.
Update SCRIPT_ID_DELIMITER, typo, markup, merge redundant sections
Typo, linebreaks, formulation tweaks