Document auth_string output parameter for google_redis_instance

[wiktorn]

Add missing documentation for auth_string for google_redis_instance.

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

[rileykarson]

Sorry for the delay, been a bunch behind on emails recently.