code: public Stream<Group> getSubGroupsStream(Object groupIdOrPath) throws GitLabApiException {
          return (getSubGroups(groupIdOrPath, getDefaultPerPage()).stream());
      }
docs: Get a Stream of visible direct subgroups in this group.
  
  <pre><code>GitLab Endpoint: GET /groups/:id/subgroups</code></pre>
  
  @param groupIdOrPath the group ID, path of the group, or a Group instance holding the group ID or path, required
  @return a Stream&lt;Group&gt; containing the group's sub-groups
  @throws GitLabApiException if any exception occurs
  @since GitLab 10.3.0