Disallow invalid inline style comments in stylesheets (#9099)

res/css/views/elements/_Tooltip.pcss

@@ -62,7 +62,7 @@ limitations under the License.
     display: none;
     position: fixed;
     border-radius: 8px;
-    z-index: 6000; // Higher than context menu so tooltips can be used everywhere
+    z-index: 6000; /* Higher than context menu so tooltips can be used everywhere */
     padding: 10px;
     pointer-events: none;
     line-height: $font-14px;
@@ -71,7 +71,7 @@ limitations under the License.
     max-width: 300px;
     word-break: break-word;
 
-    background-color: #21262C; // Same on both themes
+    background-color: #21262C; /* Same on both themes */
     color: $accent-fg-color;
     border: 0;
     text-align: center;
@@ -94,7 +94,7 @@ limitations under the License.
     }
 }
 
-// These tooltips use an older style with a chevron
+/* These tooltips use an older style with a chevron */
 .mx_Field_tooltip {
     background-color: $menu-bg-color;
     color: $primary-content;