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 Let us try looking at some data that Prometheus has collected about itself. To
use Prometheus's built-in expression browser, navigate to use Prometheus's built-in expression browser, navigate to
http://localhost:9090/graph and choose the "Console" view within the "Graph" http://localhost:9090/graph and choose the "Console" view within the "Graph" tab.
tab.
As you can gather from [localhost:9090/metrics](http://localhost:9090/metrics), As you can gather from [localhost:9090/metrics](http://localhost:9090/metrics),
one metric that Prometheus exports about itself is called one metric that Prometheus exports about itself is called
`prometheus_target_interval_length_seconds` (the actual amount of time between `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 prometheus_target_interval_length_seconds