Cleaned up and made revisions to doc

The letter "a" should not go before a vowel.
"An" goes before the word that starts with a vowel.
 The word in this case was "OpenStack".
I also added the plural version for IP Addresses.
Since we are referring to multiple IP Addresses,
we need to make sure we add "addresses" after IP.
also removed additional white space before colon

Change-Id: Ibd20045ffb83f1527007b3b4cef4763b305f724f
Cleaned up documentation

Added a period at end of sentence
Removed extra white space after the colon
IP used as plural I changed it to IP Addresses.
Originally corrected spelling for "Registring" but then removed
"Delivery and Registring" and changed sentence.

Change-Id: Ia7090824ef6b2e350e2c835e76adab272e116a6f
Merge "Cleaned up documentation"
Merge "Cleaned up and made revisions to doc"