DRIVERS-2922: Allow valid SRV hostnames with fewer than 3 parts

[aditi-khare-mongoDB]

Description

SRVs are no longer required to have a given number of parts, URI terminology is more clearly defined, and stricter parent match requirements are introduced.

What is changing?

1. Update SRV URI Validation Requirement such that needing 3 . separated parts in the hostname is no longer required.
2. Clarify that 'hostname' refers to the entire {hostname} and that the {subdomain} is only part of the hostname. Previously, in the document, {hostname} referred to the {subdomain} and 'hostname' referred to the {subdomain}.{domainname} which was confusing
3. Update the parent domain match requirement for the returned address such that SRVS with <3 parts MUST end with all parts of the SRV and have an additional domain level
4. Update the change log to reflect all of the above changes.

Proof of Concept

See here for Node's PoC/implementation of downstream changes.

Please complete the following before merging:

• Update changelog.
• Make sure there are generated JSON files from the YAML test files.
• Test changes in at least one language driver.
• Test these changes against all server versions and topologies (including standalone, replica set, sharded
  clusters, and serverless).

[nbbeeken]

Good start, there's a markdown format linter error and see comments:

[nbbeeken]

A driver MUST verify that the host names returned through SRV records have the same parent {domainname}. Drivers MUST
raise an error and MUST NOT initiate a connection to any returned host name which does not share the same
{domainname}.

This section needs adjusting to include what validation is done when there is only one level in the domain.

[ShaneHarvey]

pre-commit is failing: https://github.com/mongodb/specifications/actions/runs/10885366203/job/30202807636