doc: Elaborate on applying configuration on every boot

Signed-off-by: hamistao <[email protected]>

doc/cloud-init.md

@@ -75,11 +75,7 @@ See {ref}`cloud-init:merging_user_data` for instructions.
 To configure `cloud-init` for an instance, add the corresponding configuration options to a {ref}`profile <profiles>` that the instance uses or directly to the {ref}`instance configuration <instances-configure>`.
 
 When configuring `cloud-init` directly for an instance, keep in mind that `cloud-init` runs only on instance start.
-That means any changes to `cloud-init` configuration will only take effect after the next instance start.
-Some configuration options only take effect on the first boot of an instance. If `cloud-init` notices that an
-instance's `instance-id` has changed, it behaves as if this was the instance's first boot. For more information, see
-the [cloud-init docs](https://docs.cloud-init.io/en/latest/explanation/first_boot.html#first-boot-determination)
-If you are using the CLI client, create the instance with [`lxc init`](lxc_init.md) instead of [`lxc launch`](lxc_launch.md), and then start it after completing the configuration.
+That means any changes to `cloud-init` configuration will only take effect after the next instance start. We make sure `cloud-init` configurations are applied on any boot by changing the instance ID if any configuration keys relevant to `cloud-init` change, as this prompts `cloud-init` to fetch and apply the relevant data from LXD. For more information, see the [cloud-init docs](https://docs.cloud-init.io/en/latest/explanation/first_boot.html#first-boot-determination).
 
 To add your configuration: