VLC plugin multicast documentation fix

http://www.videolan.org/doc/vlc-user-guide/en/ch07.html documents the VLC Mozilla plugin. for multicast UDP it currently reads:

target="udp:@239.255.12.42"

note that is not correct MRL syntax so VLC attempts to open a file named udp:@239.255.12.42. \ given the correct syntax of:

target="udp://@239.255.12.42:1242"

VLC will open the multicast UDP stream.

Platform: \ openSUSE 12.1 x86_64 with Packman repository \ vlc-2.0.6-116.1 \ npapi-vlc-2.0.2_git201206081001-1.2 \

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