Update Cortex docs API link (#1614)
Update Cortex docs API link (#1614)

Looks like Cortex docs API link was changed. Existing one throws 404 which blocks CI
open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector