Docs: Update getting_started.md (#6955)

* Update getting_started.md

Signed-off-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
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@ -81,13 +81,12 @@ navigating to its metrics endpoint:
Let us try looking at some data that Prometheus has collected about itself. To
use Prometheus's built-in expression browser, navigate to
http://localhost:9090/graph and choose the "Console" view within the "Graph"
tab.
http://localhost:9090/graph and choose the "Console" view within the "Graph" tab.
As you can gather from [localhost:9090/metrics](http://localhost:9090/metrics),
one metric that Prometheus exports about itself is called
`prometheus_target_interval_length_seconds` (the actual amount of time between
target scrapes). Go ahead and enter this into the expression console:
target scrapes). Go ahead and enter this into the expression console and then click "Execute":
```
prometheus_target_interval_length_seconds