Fix description of mount filterchecks. (#901)
Fix description of mount filterchecks. (#901)

The description for container.mount.source had a typo. Also, change the
sample paths used in the descriptions for mount.source and mount.dest to
be more meaningful.
angeloc/sysdig,angeloc/sysdig,angeloc/sysdig,angeloc/sysdig,angeloc/sysdig