Add SQL Server-specific configuration section

[mosabua]

Description

Is this change a fix, improvement, new feature, refactoring, or other?

Fix. Adds documentation for existing property .

Is this a change to the core query engine, a connector, client library, or the SPI interfaces? (be specific)

Documentation only

How would you describe this change to a non-technical end user or system administrator?

Adds documentation for existing property on SQL Server connector.

Related issues, pull requests, and links

• Adds documentation for Apply snapshot isolation to all SQL Server connection when it is enabled #11662

Documentation

( ) No documentation is needed.
(✅ ) Sufficient documentation is included in this PR.
( ) Documentation PR is available with #prnumber.
( ) Documentation issue #issuenumber is filed, and can be handled later.

Release notes

(✅ ) No release notes entries required.
( ) Release notes entries required with the following suggested text:

[mosabua]

From a code perspective I think it would be better to have sqlserver.snapshot-isolation.enabled with default true .. but we cant change that with just a doc change .. .. I spelled it out as a sentence because it can be confusing...

[mosabua]

@ebyhr ... I talked to @martint when we worked on the release notes and he agrees .. the property name and default value should be refactored ... can you file a ticket for that and slot that into the queue somehow?