Inaccurate discussion of how to specify channels on CBL

https://docs.couchbase.com/sync-gateway/2.6/data-routing.html#replicating-channels-to-couchbase-lite

The following text that discusses how to filter by channels when pulling from CBL is inaccurate (the text applies for SG-replicate). Please point users to the relevant link on CBL that specifies how to configure the replicator config's channel property.

To replicate channels to Couchbase Lite, you configure the replication to use a filter named sync_gateway/bychannel with a filter parameter named channels. The value of the channels parameter is a comma-separated list of channels to fetch.