fix: non-vendor prefixed clamp

src/theme/DocCard/styles.module.css

@@ -31,6 +31,7 @@
   font-size: 1rem;
   display: -webkit-box;
   -webkit-line-clamp: 2;
+  line-clamp: 2;
   -webkit-box-orient: vertical;
   overflow: hidden;
   text-overflow: ellipsis;