[Freeswitch-docs] Some moves

Good morning all, I moved a few more. The interesting one is "Abstraction Interfaces". This is really a guide for the core-development guys. But there isn't much in the confluence tree that addresses them. So I popped it under Community/ContributingCode/NewModules/AbstractionInterface for now, but I left it visible only to the core-dev group and us. Shall I create a top-level topic for "Development" or "Internals" or "FreeSWITCH-Core" or something along those lines? Pat