Connection & Settings Docs issues

Collecting (mostly Jeff's) Doc tickets covering Connections in https://docs.couchbase.com/dotnet-sdk/2.7/managing-connections.html & https://docs.couchbase.com/dotnet-sdk/2.7/client-settings.html
.
These need fixing for 2.7

[and building into updated Client Settings and Managing Connections docs for 3.0
Work with Richard Smedley on template for the latter versions – see NCBC-2197 ]
.
Client Settings docs:
DOC-1956
DOC-2998
DOC-3864
DOC-5637
DOC-5957
.
Managing Connections Docs:
DOC-554
DOC-2991
DOC-2998