clean up of section_floating-ips

capitalized IP to flow with rest of doc
changed an floating ip to a floating ip in 4 places
changed interactive to interact
added the before neutron
added the before compute
added space between words that were joined

Change-Id: Ib937ce4366a90e67f485388b2112a1ce3d337f41
Merge "clean up of section_floating-ips"