[CB-3962] fix inline text in upgrading sections; add more vertical space in listings

Conflicts:

	docs/en/edge/guide/platforms/blackberry10/index.md
[CB-4379] replace plugin tag w/feature in guide content, rm plugins tag

Conflicts:

	docs/en/edge/guide/platforms/android/plugin.md
minor fmt changes to plugman spec doc
[CB-3816] allow more xrefs to APIs in 'plugin add' xection
inline fmt for default values