[mythtv] Documentation patch for section 9.3 of the HOWTO

[Scott Rowe]

Cc'ing the dev list, just in case..

Changed the order of the text, to make sure that even users who don't read
all the docs will see the important stuff first, standardized on
'non-master' instead of 'slave' (not being PC, just being consistent.)
----------------------------


9.3 Configuring a non-master backend. 

Ensure that you've granted access to the master MySQL database for remote
backends as discussed in the section titled Modifying access to the MySQL
database for multiple systems
<http://www.mythtv.org/docs/mythtv-HOWTO-6.html#modify_perm_mysql> and that
you've edited the /usr/local/share/mythtv/mysql.txt file and put the correct
IP address, username, and password for the database server before you launch
setup on the non-master backend.

Make sure that the IP addresses on the 'General' setup section are accurate.
If the non-master backend can't communicate with the master backend due to
IP address misconfiguration then MythTV will not function properly.

Configuration of a non-master backend follows the same general procedure as
that of the master backend, with the exception that you skip over the "Video
Sources" step. All possible video sources need to be defined on the master
backend system; only the master backend will query a listings provider to
obtain guide data for all the non-master backends. 

NOTE: Do not run mythfilldatabase on a non-master backend.