feedback for Analytics introduction

https://docs-staging.couchbase.com/server/7.1/analytics/introduction.html

• Why "over many records"? It should be "over many documents"

• This section should be expanded: When to Use Analytics
  See: https://blog.couchbase.com/n1ql-to-query-or-to-analyze/
  and https://blog.couchbase.com/part-2-n1ql-to-query-or-to-analyze/

Also, the first paragraph of this page gives an impression that Analytics is expensive... I know that's not the intention. Review and rewrite.
See:
Couchbase Analytics is a parallel data management capability for Couchbase Server. Couchbase Analytics is designed to efficiently run complex queries over many records. By complex queries, we mean large ad hoc join, set, aggregation, and grouping operations, any of which may result in long running queries, high CPU usage, high memory consumption, and/or excessive network latency due to data fetching and cross node coordination.