Adding API Docs for google_workbench_instance for registry

[NA2047]

Adding API Docs for google_workbench_instance for registry

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

workbench: added API Docs for `google_workbench_instance`

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

@shuyama1, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 5 insertions(+))
google-beta provider: Diff ( 1 file changed, 5 insertions(+))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 5 insertions(+))
google-beta provider: Diff ( 1 file changed, 5 insertions(+))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 5 insertions(+))
google-beta provider: Diff ( 1 file changed, 5 insertions(+))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 5 insertions(+))
google-beta provider: Diff ( 1 file changed, 5 insertions(+))