Fix IAM authentication reference link in Aurora setup guide (#32726)

Author: billykern

content/en/database_monitoring/setup_postgres/aurora.md

@@ -66,7 +66,7 @@ Create the `datadog` user:
 CREATE USER datadog WITH password '<PASSWORD>';
 ```
 
-**Note:** IAM authentication is also supported. Please see [the guide][13] on how to configure this for your Aurora instance.
+**Note:** IAM authentication is also supported. Please see [the guide][14] on how to configure this for your Aurora instance.
 
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