Fix the description template for PrometheusRemoteWriteDesiredShards
Fix the description template for PrometheusRemoteWriteDesiredShards

Signed-off-by: beorn7 <91e32ae1d26bd312b370cf8378a5a83accca90a0@grafana.com>

kangwoo/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,kangwoo/prometheus,prometheus/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,kangwoo/prometheus,alileza/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,alileza/prometheus,kangwoo/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus