fix(docs-infra): enable only vertical scrolling for contributors bio (angular#30991)

- `auto` will enable scrolling only when needed
- `overflow-y` will ensure to keep the scrolling horizontally only

PR Close angular#30991

Author: alan-agius4

aio/src/styles/2-modules/_contributor.scss

@@ -188,7 +188,7 @@ aio-contributor {
     line-height: 18px;
     margin: 8px 16px;
     text-overflow: ellipsis;
-    overflow: scroll;
+    overflow-y: auto;
     font-weight: 400;
   }
 }