Simplify usage string
Simplify usage string

Signed-off-by: Goutham Veeramachaneni <caf616f34019d2c106581c18639c41d1bae35076@iith.ac.in>

amorken/prometheus,prometheus/prometheus,kangwoo/prometheus,keegancsmith/prometheus,Conorbro/prometheus,brancz/prometheus,amorken/prometheus,yanghongkjxy/prometheus,keegancsmith/prometheus,Conorbro/prometheus,AlekSi/prometheus,brancz/prometheus,keegancsmith/prometheus,AlekSi/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,kangwoo/prometheus,alileza/prometheus,alileza/prometheus,brancz/prometheus,Stackdriver/stackdriver-prometheus,alileza/prometheus,yanghongkjxy/prometheus,prometheus/prometheus,Gouthamve/prometheus,yanghongkjxy/prometheus,Stackdriver/stackdriver-prometheus,alileza/prometheus,kangwoo/prometheus,prometheus/prometheus,Conorbro/prometheus,Conorbro/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,amorken/prometheus,amorken/prometheus,alileza/prometheus,Stackdriver/stackdriver-prometheus,kangwoo/prometheus,prometheus/prometheus,Gouthamve/prometheus,yanghongkjxy/prometheus,AlekSi/prometheus,AlekSi/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Stackdriver/stackdriver-prometheus,GoogleCloudPlatform/prometheus