ovs-ofctl: Correct formatting of instructions in manpage.

Adjust formatting in ovs-ofctl manpage so that apply_actions, clear_actions
write_metadata and goto_table appear at the same level of indentation as
actions rather being indented as if they are arguments to the learn action.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>