Add a / between repo and branch for clear separation

https://imgur.com/v32OXPp

Change-Id: Ia6117ab8a6784f0d12e7755234ecdef5f4af9ea0

polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.html

@@ -210,9 +210,10 @@ limitations under the License.
       <template is="dom-if"
                 if="[[_computeShowRepoBranchTogether(change.project, change.branch)]]">
         <section>
-          <span class="title">Repo Branch</span>
+          <span class="title">Repo / Branch</span>
           <span class="value">
             <a href$="[[_computeProjectUrl(change.project)]]">[[change.project]]</a>
+            /
             <a href$="[[_computeBranchUrl(change.project, change.branch)]]">[[change.branch]]</a>
           </span>
         </section>