change to section_overview-horizon

added space between cURLcommands
added space between CIDRbox
added space between Instancescategory
added space between Actionscolumn
removed hyphen between keypair
added space between MoreDrop-down list

Change-Id: Id11a1a8d2f57c1974e0ef32fbcf50dd10b6ee697
Merge "change to section_overview-horizon"