Fix description of org_id in google_project_ancestry data source

[bestefreund]

Fix description of org_id and example-code in google_project_ancestry data source

Fixes: hashicorp/terraform-provider-google#25306

resourcemanager: fixed description of `org_id` and the example-code in the documentation of the `google_project_ancestry` data source

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[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, 2 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))

[github-actions]

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