Add text about release notes

Add some texts that describes that the links go to release notes.

Also, some space reformatting because I edited in Oxygen.

Patchset clarifies the version numbering is for all but Object Storage.
Patchset revises based on reviewer's comment.
Fixes bug 1161896

Change-Id: I6bde10acaecb193281de185575c659ac69ebebcb
Merge "Add text about release notes"