doc/configuration.txt: Emphasise the point about buses and outputs  having matching sampling rates and channels.
doc/configuration.txt: Emphasise the point about buses and outputs 
having matching sampling rates and channels.


git-svn-id: 5a113f46df058f8047e288f4f3e948d899353d9a@383 410355f2-c4ea-45de-a5b5-301721f902b9

mwcampbell/prs,mwcampbell/prs,mwcampbell/prs