Transactions documentation is outdated

[programmatix]

It links to 6.5 server docs, references transactions library 1.0.0, and a minimum server version of 6.5.

See https://docs.couchbase.com/java-sdk/current/howtos/distributed-acid-transactions-from-the-sdk.html for the latest info.

[programmatix]

There is also an odd 'leveloffset' artifact here:

`

We are also looking into tighter integration of the transaction library into the spring data library ecosystem. :leveloffset: -1 `

[mikereiche]

looks like this got fixed at some point.