Add Prometheus Link for scrape_configs (#9270)

**What this PR does / why we need it**:
Adds some context to the scrape configs section in Promtail Config Docs
to ensure clarity around the connection to Prometheus
Here is a link to a slack thread where the customer was confused on
this:
https://raintank-corp.slack.com/archives/C04KY6NJSCE/p1681761335754199

---------

Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>
Co-authored-by: J Stickler <julie.stickler@grafana.com>

docs/sources/clients/promtail/configuration.md

@@ -356,7 +356,7 @@ is restarted to allow it to continue from where it left off.
 ## scrape_configs
 
 The `scrape_configs` block configures how Promtail can scrape logs from a series
-of targets using a specified discovery method:
+of targets using a specified discovery method. Promtail uses the same [Prometheus scrape_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config). This means if you already own a Prometheus instance, the config will be very similar:
 
 ```yaml
 # Name to identify this scrape config in the Promtail UI.