docs/integrations/prometheus: drop commit mistake

Looks like this line was added to see the length of the lines below, and was accidentally committed in e9d2e0b8

/cc @aqualls @cnorris

doc/user/project/integrations/prometheus.md

@@ -199,7 +199,6 @@ to integrate with.
 
 ### Precedence with multiple Prometheus configurations
 
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 Although you can enable both a [manual configuration](#manual-configuration-of-prometheus)
 and [auto configuration](#managed-prometheus-on-kubernetes) of Prometheus, you
 can use only one: