[docs] ops guid applying patch can't be followed

[Andrew Woodward]

in http://docs.mirantis.com/openstack/fuel/fuel-6.0/operations.html?highlight=patch#applying-a-patch

issues:

obtaining a patch, directions don't include review (review.openstack.org) links, doesn't include how to follow from a launchpad bug, doesn't talk about backported patches via LP

applying a patch:

doesn't explain using -p1 or -p2 which is common to need
doesn't explain how to patch a fuel component inside a docker container

[Irina Povolotskaya (ipovolotskaya)]

Andrew, thank you for reporting about the issue! Who could help us with that?

[Evgeny Konstantinov (evkonstantinov)]

@Andrew, since this has changed for 6.1 and newer, do we still need this?

The current procedure is described at https://docs.mirantis.com/openstack/fuel/fuel-6.1/operations.html#applying-patches