Doc libvirt_snapshot_compression option

fixes bug 1111091

libvirt_snapshot_compression -added in grizzly, enables compression
for qcow2 options in libvirt. This patch adds the option to the table.

Change-Id: Ie29ea1f8023c879bf1f6e2fc5bf77dcd1ec9fa61
Tweak GroupAntiAffinityFilter doc

fixes bug 1128587

Gary Kotton noted in the bug that multiple hints were being
specified in the commandline example for the GroupAntiAffinityFilter

This patch fixes this and adds a descriptive line about what the hint
is used for.

patch2 encloses group and server1 in the description in literal tags

patch3 fixes one of the literal tags

Change-Id: Ie15ea3deebd44e0caaf5a01d45cb90d5ed0a9d9e
Merge "Tweak GroupAntiAffinityFilter doc"
Merge "Doc libvirt_snapshot_compression option"