Added configuration instructions for audio device sharing in Linux

Ignore-this: 45af82cd6d49be5161621918839cacdc

darcs-hash:20100521071212-58252-d542c13dd5871e9b2a92df9783a6cfe46897f3fa
Update audio device sharing on linux documentation

Ignore-this: ebc1095ba7cc95610c5b87814410a2ee

darcs-hash:20100521121226-58252-3a1ab9ec4de7c9b0c59babbd219b5eb1a3501949