Devguide code includes

As code samples move to module/devguide/examples in Java,
update the include:// fsom https://docs.couchbase.com/server/7.1/guides/creating-data.html  etc.,

to point to 3.4@ for <7.2,

and devguide examples for 7.2 / 7.6 / Capella

& do same in .NET and Node.js.