Disallow invalid inline style comments in stylesheets (#9099)

res/css/structures/_RoomDirectory.pcss

@@ -80,7 +80,7 @@ limitations under the License.
             font-size: $font-14px;
             line-height: $font-20px;
             color: $secondary-content;
-            max-width: 464px; // easier reading
+            max-width: 464px; /* easier reading */
         }
 
         > hr {
@@ -125,8 +125,8 @@ limitations under the License.
         mask: url("$(res)/img/feather-customised/user.svg");
         mask-repeat: no-repeat;
         mask-position: center;
-        // scale it down and make the size slightly bigger (16 instead of 14px)
-        // to avoid rendering artifacts
+        /* scale it down and make the size slightly bigger (16 instead of 14px) */
+        /* to avoid rendering artifacts */
         mask-size: 80%;
         width: 16px;
         height: 16px;