style(endpoint-initialization): update requirement message for local endpoint init (#424)

app/components/endpointInit/endpointInit.html

@@ -31,9 +31,9 @@
             <!-- local-endpoint -->
             <div ng-if="formValues.endpointType === 'local'" style="margin-top: 25px;">
               <div class="form-group">
-                <div class="col-sm-12">
-                  <span class="small text-muted">Note: ensure that the Docker socket is bind mounted in the Portainer container at <code>/var/run/docker.sock</code></span>
-                </div>
+                <i class="fa fa-exclamation-triangle" aria-hidden="true" style="margin-right: 5px;"></i>
+                <span class="small text-primary">This feature is not available with Docker <b>on</b> Windows yet.</span>
+                <div class="small text-primary">On Linux / Mac, ensure that you have started Portainer container with the following Docker flag <code>-v "/var/run/docker.sock:/var/run/docker.sock"</code></div>
               </div>
               <!-- connect button -->
               <div class="form-group" style="margin-top: 10px;">