doc: list connector_enforcement options.

[guissalustiano]

The current description is misleading, as it implies that the field is a boolean.

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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(-))