Fix link

The link was to an informalfigure, make it a link to the section
called "Conceptual Architecture."

Currently the text is displayed as "As shown in ???, the"

Change-Id: I2a0f0b25e80a72dd9f8a5895582284e97086eb3d
Confirmed Cinder package list for Fedora/RHEL

Confirmed that the packages listed are correct for installation of
Cinder on Fedora and RHEL.

Change-Id: Id9b84088c2670d5b34ca5754428433ccf69d4402
Merge "Fix link"