Fix reference links on dashboard.rst

[darksidemilk]

There are inline links to other management pages in the original wiki https://wiki.fogproject.org/wiki/index.php?title=Managing_FOG#Dashboard

Trying to recreate them in rst here https://fogproject.readthedocs.io/en/latest/management/index.html#menu-bar

Having trouble getting them working as intended. Can get :doc: links to work but it takes them to the referenced pages instead of the referenced spot in the index and you lose the dynamic table of contents.

[darksidemilk]

see also https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html#ref-role

[darksidemilk]

fixed in this commit

https://github.com/FOGProject/fog-docs/commit/9df9612fe0f3c904e23250708f3062804bda7403