This fixes a number of broken links throughout the
tree, mostly caused by wiki.asterisk.org being replaced
with docs.asterisk.org, which should eliminate the
need for sporadic fixes as in f28047db36.
Resolves: #430
Added links to the wiki to replace references to outdated
tex docs.
ASTERISK-27430
Reported by: Corey Farrell
Change-Id: I5007e732b30bc7b63d124c530ae8857c89991209