Fixed warning in astman for gcc-4.8.


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@395984 f38db490-d61c-443f-a65b-d21fe96a405b
Fix documentation replication issues

This prevents XML documentation duplication by expanding channel and
bridge snapshot tags into channel and bridge snapshot parameter sets
with a given prefix or defaulting to no prefix. This also prevents
documentation from becoming fractured and out of date by keeping all
variations of the documentation in template form such that it only
needs to be updated once and keeps maintenance to a minimum.

Review: https://reviewboard.asterisk.org/r/2708/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@395985 f38db490-d61c-443f-a65b-d21fe96a405b