Document the timings profile option for Analytics

Update this Analytics doc link: https://docs.couchbase.com/server/current/analytics/rest-service.html#query-service

Section: Query Parameters

Add this after the "pretty" section

>>> (see query for reference: https://docs.couchbase.com/server/current/n1ql/n1ql-rest-api/)

profile.       Specifies if there should be a profile section returned with the request results. The valid values are:

optional

                   off

                           No profiling information is added to the query response.

                   timings
          The query response document will include a full query plan with timing and information about the number of processed documents at each phase. This information will be included in the system:active_requests and system:completed_requests keyspaces.

If profile is not set as one of the above values, then the profile setting does not change.

Example : "timings"

>>>