Provide a link to the Bucket storage engine selection page

On the following page:

https://docs-staging.couchbase.com/server/7.1/learn/buckets-memory-and-storage/storage-engines.html#when-should-you-use-couchstore

When talking about "The choice of Couchstore or Magma is available at the Bucket level.", please provide a link to the page where one chooses Couchstore or Magma at bucket level.

In general documentation should have as much cross-linking as possible.