CI: Change target branch in CI task trigger-docs-update (#18255)
CI: Change target branch in CI task trigger-docs-update (#18255)

This changes trigger-docs-update job so that the docs build goes to production.

There is no additional risk to push a broken site in production. The docs build process is to publish to staging, then wait for a manual approval before publishing to prod.
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana