Cleaning up iOS build docs for FPLBase.
Cleaning up iOS build docs for FPLBase.

I cleaned up the example bash shell commands, such that the guide
can be more easily followed line-by-line.

I also fixed some broken links and cleaned up the doxygen syntax.

Tested: Tested on Ubuntu using generate_docs.py and viewed on
Chrome.

Change-Id: I53be92c55c67702cf14d229a8c4db825014135c4

google/fplbase,google/fplbase,google/fplbase,google/fplbase