docs: update r/vsphere_nic docs

[tenthirtyam]

Description

• Updated the example to show services instead of enabled_services.
• Updated minor markdown errors.
• Updated CHANGELOG.md.

Release Note

IMPROVEMENTS:

* `vsphere_nic`: Documentation updates to resource.

References

Closes #1976

[github-actions]

This functionality has been released in v2.5.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[rismoney]

Slightly tangential to this documentation, that I just ran into
If netstack is vmotion, services cannot be set, since I think these 2 settings are mutually exclusive, not purely optional. Also I think it's a bug that probably needs to be filed, but I believe if netstack is set to vmotion, there will be a subsequent diff problem where the provider will state that the 'service' value will be removed , since netstack adds that service as an implicit service, creating a catch-22 [netstack set, and service being unsettable]. I worked around this by ignore changes on service, but I thought it worthwhile to mention.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.