Fix mobile doc

I also suggest to remove the "Adding missing files (Upgrading from version below 0.8)" section
http://docs.camptocamp.net/c2cgeoportal/1.4/integrator/mobile.html#adding-missing-files-upgrading-from-version-below-0-8
since it's probably better to recreate the app from scratch when moving from c2cgeoportal <0.8 to 1.4.
Ditto for the "Adding missing files (Upgrading from version below 1.2)" section?