Fixed a11y refresh button issue for Documents tab

less/documentDB.less

@@ -2245,7 +2245,8 @@ a:link {
 }
 
 .refreshColHeader {
-  padding: 3px 6px 10px 0px !important;
+  padding: 3px 0px 10px 0px !important;
+  width: 15px;
 }
 
 .refreshColHeader:hover {

src/Explorer/Graph/GraphExplorerComponent/EditorNodePropertiesComponent.tsx

@@ -222,7 +222,6 @@ export class EditorNodePropertiesComponent extends React.Component<EditorNodePro
                     this.props.onUpdateProperties(this.props.editedProperties);
                   }}
                   required
-                  aria-label="Select Type"
                 >
                   {EditorNodePropertiesComponent.VERTEX_PROPERTY_TYPES.map((type: string) => (
                     <option value={type} key={type}>

src/Explorer/Tabs/DocumentsTab.html

@@ -158,13 +158,13 @@
                   role="button"
                   aria-label="Refresh documents"
                   data-bind="event: { keydown: onRefreshButtonKeyDown }"
+                  tabindex="0"
                 >
                   <img
                     class="refreshcol"
                     src="/refresh-cosmos.svg"
                     data-bind="click: refreshDocumentsGrid"
                     alt="Refresh documents"
-                    tabindex="0"
                   />
                 </th>
               </tr>

src/Explorer/Tabs/QueryTab/QueryTabComponent.tsx

@@ -215,13 +215,13 @@ export default class QueryTabComponent extends React.Component<IQueryTabComponen
       {
         metric: "Request Charge",
         value: this.state.requestChargeDisplayText,
-        toolTip: "",
+        toolTip: "Request Charge",
         isQueryMetricsEnabled: true,
       },
       {
         metric: "Showing Results",
         value: this.state.showingDocumentsDisplayText,
-        toolTip: "",
+        toolTip: "Showing Results",
         isQueryMetricsEnabled: true,
       },
       {