Update keyboard shortcuts dialog to account for new actions

+ Clarify wording on expanding inline diffs.
+ Add shortcuts for expanding/collapsing all comments.

Change-Id: Ia63a02dbea7f8c97a10b74553d5edee5d8eb31e9

polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.html

@@ -98,13 +98,6 @@ limitations under the License.
             <td><span class="key">u</span></td>
             <td>Up to change list</td>
           </tr>
-          <tr>
-            <td>
-              <span class="key modifier">Shift</span>
-              <span class="key">i</span>
-            </td>
-            <td>Show/hide inline diffs</td>
-          </tr>
         </tbody>
         <!-- Diff View -->
         <tbody hidden$="[[!_computeInView(view, 'gr-diff-view')]]" hidden>
@@ -176,6 +169,13 @@ limitations under the License.
             <td><span class="key">Enter</span> or <span class="key">o</span></td>
             <td>Show selected file</td>
           </tr>
+          <tr>
+            <td>
+              <span class="key modifier">Shift</span>
+              <span class="key">i</span>
+            </td>
+            <td>Show/hide all inline diffs</td>
+          </tr>
           <tr>
             <td><span class="key">i</span></td>
             <td>Show/hide selected inline diff</td>
@@ -213,6 +213,17 @@ limitations under the License.
             </td>
             <td>Go to previous comment thread</td>
           </tr>
+          <tr>
+            <td><span class="key">e</span></td>
+            <td>Expand all comment threads</td>
+          </tr>
+          <tr>
+            <td>
+              <span class="key modifier">Shift</span>
+              <span class="key">e</span>
+            </td>
+            <td>Collapse all comment threads</td>
+          </tr>
           <tr>
             <td>
               <span class="key modifier">Shift</span>
@@ -276,6 +287,17 @@ limitations under the License.
             </td>
             <td>Show previous comment thread</td>
           </tr>
+          <tr>
+            <td><span class="key">e</span></td>
+            <td>Expand all comment threads</td>
+          </tr>
+          <tr>
+            <td>
+              <span class="key modifier">Shift</span>
+              <span class="key">e</span>
+            </td>
+            <td>Collapse all comment threads</td>
+          </tr>
           <tr>
             <td>
               <span class="key modifier">Shift</span>