Bug 1225597 - Docs: Use anonymous links to avoid build warnings
Bug 1225597 - Docs: Use anonymous links to avoid build warnings

Fixes:
common_tasks.rst:2: WARNING: Duplicate explicit target name: "stage".
common_tasks.rst:2: WARNING: Duplicate explicit target name: "production".

http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#anonymous-hyperlinks

KWierso/treeherder,akhileshpillai/treeherder,KWierso/treeherder,wlach/treeherder,edmorley/treeherder,tojonmz/treeherder,edmorley/treeherder,KWierso/treeherder,tojon/treeherder,sylvestre/treeherder,akhileshpillai/treeherder,avih/treeherder,tojonmz/treeherder,glenn124f/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,tojon/treeherder,wlach/treeherder,tojon/treeherder,glenn124f/treeherder,parkouss/treeherder,glenn124f/treeherder,kapy2010/treeherder,avih/treeherder,avih/treeherder,kapy2010/treeherder,tojonmz/treeherder,kapy2010/treeherder,sylvestre/treeherder,kapy2010/treeherder,parkouss/treeherder,tojon/treeherder,KWierso/treeherder,sylvestre/treeherder,tojonmz/treeherder,avih/treeherder,parkouss/treeherder,tojonmz/treeherder,parkouss/treeherder,akhileshpillai/treeherder,wlach/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,wlach/treeherder,parkouss/treeherder,avih/treeherder,avih/treeherder,kapy2010/treeherder,sylvestre/treeherder,edmorley/treeherder,parkouss/treeherder,glenn124f/treeherder,sylvestre/treeherder,akhileshpillai/treeherder,tojonmz/treeherder,sylvestre/treeherder,wlach/treeherder,wlach/treeherder,edmorley/treeherder