Update API docs with debugging tips
Update API docs with debugging tips

I duplicated the instructions for how to run an app under DR under gdb
from process start, and added a link to the wiki for additional tips.

Review URL: https://codereview.appspot.com/6856047

SVN-Revision: 1707

sigma-random/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,AmesianX/dynamorio