aiven: litt mer tydlig hva den gjør

docs/operate/cli/reference/aiven.md

@@ -5,8 +5,8 @@ conditional: [tenant, nav]
 
 # aiven command
 
-The aiven command can be used to create a `AivenApplication` and extract credentials.
-The `aiven create service` command will create a Protected & time-limited `AivenApplication` in your specified namespace.
+The aiven commands can be used to give access to an already existing Aiven instance by creating a `AivenApplication` in your specified namespace and extract credentials.
+Specifically the `aiven create service` command will create a personal, protected, and time-limited credential.
 This uses your currently configured kubectl context, so in order for it to work you need to select a suitable context first.
 For instance, credentials for nav-prod can only be generated in the prod clusters.