Item9693: Add some missing pieces to docs

the <nop> escape is not covered in EditingShorthand.  Also
Verbatim/Literal/Pre are scattered and not summerized.

git-svn-id: http://svn.foswiki.org/trunk/core@17819 0b4bb1d4-4e5a-0410-9cc4-b2b747904278