Update getting started link (grafana#26374)

Author: DanCech

emails/templates/welcome_on_signup.html

@@ -29,7 +29,7 @@ <h4>Hi [[.Name]],</h4>
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-							If you are new to Grafana please read the <a href="https://docs.grafana.com/guides/gettingstarted/">Getting Started</a> guide.
+							If you are new to Grafana please read the <a href="https://grafana.com/docs/grafana/latest/getting-started/getting-started/">Getting Started</a> guide.
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