Update r/_pkgdown.yml

Co-authored-by: Jonathan Keane <jkeane@gmail.com>

Author: thisisnic

r/_pkgdown.yml

@@ -365,6 +365,6 @@ footer:
     left: older_versions
     right: [built_with, legal]
   components:
-    older_versions: |
-      [Older versions of these docs](https://arrow.apache.org/docs/r/versions.html)
-      <br><small>Apache Arrow, Arrow, Apache, the Apache logo, and the Apache Arrow project logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</small>
+    older_versions: "[Older versions of these docs](https://arrow.apache.org/docs/r/versions.html)"
+    legal: |
+      <small>Apache Arrow, Arrow, Apache, the Apache logo, and the Apache Arrow project logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</small>