remove prometheus monitoring and global object

Signed-off-by: Devarsh <devarshshah2608@gmail.com>

docs/guides/cadvisor.md

@@ -103,15 +103,7 @@ version: '3.8'
 configs:
   prometheus_config:
     content: |
-      global:
-        scrape_interval: 15s
-        evaluation_interval: 15s
-
       scrape_configs:
-        - job_name: 'prometheus'
-          static_configs:
-            - targets: ['localhost:9090']
-
         - job_name: 'cadvisor'
           scrape_interval: 5s
           static_configs: