[docgen] Rename Version to Spec Version on the hw dashboard

This is done to make it clear that the revision number is with respect
to a certain design spec / feature set of the IP.

See also discussion on #11694 for more context.

Signed-off-by: Michael Schaffner <msf@opentitan.org>

site/docs/layouts/shortcodes/dashboard.html

diff --git a/site/docs/layouts/shortcodes/dashboard.html b/site/docs/layouts/shortcodes/dashboard.html
index 43e7279..a2477eb 100644
--- a/site/docs/layouts/shortcodes/dashboard.html
+++ b/site/docs/layouts/shortcodes/dashboard.html
@@ -3,7 +3,7 @@
     <tr>
       <th>Design Spec</th>
       <th>DV Document</th>
-      <th><a href="{{ relref . "doc/project/development_stages#versioning" }}">Version</a></th>
+      <th><a href="{{ relref . "doc/project/development_stages#versioning" }}">Spec Version</a></th>
       <th colspan="4"><a href="{{ relref . "doc/project/development_stages#life-stages" }}">Development Stage</a></th>
       <th>Notes</th>
     </tr>