docs: update usages

Signed-off-by: Luca Di Maio <[email protected]>

docs/usage/distrobox-create.md

@@ -15,9 +15,9 @@ graphical apps (X11/Wayland), and audio.
 
 **distrobox create**
 
-	--image/-i:		image to use for the container  default: ${container_image_default}
+	--image/-i:		image to use for the container	default: ${container_image_default}
 	--name/-n:		name for the distrobox          default: ${container_name_default}
-	--hostname:		hostname for the distrobox      default: <container-name>.<system hostname>
+	--hostname:		hostname for the distrobox      default: <container-name>.$(uname -n)
 	--pull/-p:		pull the image even if it exists locally (implies --yes)
 	--yes/-Y:		non-interactive, pull images without asking
 	--root/-r:		launch podman/docker/lilipod with root privileges. Note that if you need root this is the preferred

docs/usage/distrobox-enter.md

@@ -17,7 +17,7 @@ If using it inside a script, an application, or a service, you can specify the
 **distrobox enter**
 
 	--name/-n:		name for the distrobox						default: my-distrobox
-	--/-e:			end arguments execute the rest as command to execute at login	default: default $USER's shell
+	--/-e:			end arguments execute the rest as command to execute at login	default: default ${USER}'s shell
 	--no-tty/-T:		do not instantiate a tty
 	--no-workdir/-nw:	always start the container from container's home directory
 	--additional-flags/-a:	additional flags to pass to the container manager command

docs/usage/distrobox-ephemeral.md

@@ -18,7 +18,7 @@ when the command is terminated.
 				specify it through the DBX_SUDO_PROGRAM env variable, or 'distrobox_sudo_program' config variable)
 	--verbose/-v:		show more verbosity
 	--help/-h:		show this message
-	--/-e:			end arguments execute the rest as command to execute at login	default: default $USER's shell
+	--/-e:			end arguments execute the rest as command to execute at login	default: default ${USER}'s shell
 	--version/-V:		show version
 
 # EXAMPLES