doc: update link from released doc to master

Documents generated for a tagged release have a header that mentions
that the "latest" (master branch) version of the doc may be more up to
date, but the link to the corresponding master doc is missing the
/latest/ (previously the master docs were in the root folder.

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Fixes: #17764