Fix the link to the wiki page in about.html.
Fix the link to the wiki page in about.html.

Change-Id: I9fe8a6f6cf6afae8eceec62d71b8ecd61ddd6f0c

markvoelker/refstack,openstack/refstack,stackforge/refstack,markvoelker/refstack,openstack/refstack,stackforge/refstack,markvoelker/refstack,openstack/refstack,openstack/refstack,stackforge/refstack,markvoelker/refstack,stackforge/refstack