Cover N1QL in FTS

We should have N1QL and Query Builder versions covered under FTS. Similar to the regular query section.  

Also include an example of using MATCH function.  Create a FTS Index and use that in query SELECT * from _ WHERE MATCH(ftsIndex, "searchStr") (edited) 

https://couchbase.slack.com/archives/DQK2LD55X/p1636381901001500