Added missing link to documentation of groups data source in website/azuredevops.erb
<li>
<a href="/docs/providers/azuredevops/d/group.html">azuredevops_group</a>
</li>
+ <li>
+ <a href="/docs/providers/azuredevops/d/groups.html">azuredevops_groups</a>
+ </li>
<li>
<a href="/docs/providers/azuredevops/d/iteration.html">azuredevops_iteration</a>
</li>
