docs: fix datastream gcs destination

[Xilis]

Incorrect file rotation interval description.

Current docs mention that default is 900s which is incorrect (assuming this was copied from the bigquery freshness). I believe the default gcs file rotation values from api are 60s / 50mb respectively (from a stream created through UI), but not sure if there is an authoritative source to validate that and/or if that should be specified here.

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

[github-actions]

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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 ( 2 files changed, 4 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 2 files changed, 4 insertions(+), 2 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 2 insertions(+), 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 19
Passed tests: 9
Skipped tests: 10
Affected tests: 0

Click here to see the affected service packages

• datastream

🟢 All tests passed!

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