Clarify 'generate.copy.outer' options
Clarify 'generate.copy.outer' options

Adjust titles to reflect the purpose of each setting

Signed-off-by: Roger Sheen <a61a1add71dadc74037ae5e44ee30713db9a7451@infotexture.net>

shaneataylor/docs,dita-ot/docs,shaneataylor/docs,infotexture/docs,infotexture/docs