Update etcd.io._0_base.yaml

Update www.etcd.io Netlify CNAME from `.com` to `.app`, which tracks with Netlify best practices documented here: https://answers.netlify.com/t/deprecating-automatic-com-redirects/115442

Author: publicfacingusername

dns/zone-configs/etcd.io._0_base.yaml

@@ -26,7 +26,7 @@ _gh-kubernetes-e:
 
 www:
   - type: CNAME
-    value: etcd.netlify.com.
+    value: etcd.netlify.app.
 
 mail:
   - type: CNAME