incus: Clarify device override syntax

Closes #1470

Signed-off-by: Stéphane Graber <stgraber@stgraber.org>

cmd/incus/create.go

@@ -44,7 +44,10 @@ func (c *cmdCreate) Command() *cobra.Command {
 	cmd.Example = cli.FormatSection("", i18n.G(`incus create images:ubuntu/22.04 u1
 
 incus create images:ubuntu/22.04 u1 < config.yaml
-    Create the instance with configuration from config.yaml`))
+    Create the instance with configuration from config.yaml
+
+incus launch images:debian/12 v2 --vm -d root,size=50GiB -d root,io.bus=nvme
+    Create and start a virtual machine, overriding the disk size and bus`))
 
 	cmd.Aliases = []string{"init"}
 	cmd.RunE = c.Run

cmd/incus/launch.go

@@ -33,7 +33,10 @@ incus launch images:ubuntu/22.04 u2 -t aws:t2.micro
     Create and start a container using the same size as an AWS t2.micro (1 vCPU, 1GiB of RAM)
 
 incus launch images:ubuntu/22.04 v1 --vm -c limits.cpu=4 -c limits.memory=4GiB
-    Create and start a virtual machine with 4 vCPUs and 4GiB of RAM`))
+    Create and start a virtual machine with 4 vCPUs and 4GiB of RAM
+
+incus launch images:debian/12 v2 --vm -d root,size=50GiB -d root,io.bus=nvme
+    Create and start a virtual machine, overriding the disk size and bus`))
 	cmd.Hidden = false
 
 	cmd.RunE = c.Run