local/bin/homeinit: Fix documentation.

.local/bin/homeinit

@@ -10,13 +10,13 @@ ROOT=$HTTPS_ROOT
 PROFILE=/tmp/homeinit-$USER/homeinit
 USER_NAME=Ambrevar
 SUBSTITUTE_URLS=https://ci.guix.gnu.org
+## Hardcoded in .mbsyncrc:
+MAIL_CACHE="$HOME/.cache/mail"
 
 [ -z "$SOURCEDIR" ] && SOURCEDIR="$HOME/personal"
 [ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
 [ -z "$XDG_DATA_HOME" ] && XDG_DATA_HOME="$HOME/.local/share"
 [ -z "$XDG_BIN_HOME" ] && XDG_BIN_HOME="$XDG_DATA_HOME/../bin"
-## Hardcoded in .mbsyncrc:
-MAIL_CACHE="$HOME/.cache/mail"
 
 usage() {
 	cat <<EOF>&2
@@ -26,7 +26,7 @@ Initialize user profile: install packages, set up folders, etc.
 
 Options:
 
-  -g DEVICE: Device where to sync ~/.gnupg.
+  -g DEVICE: Device where to sync ~/.gnupg from, e.g. '/dev/sda1'.
   -u:        Skip large updates (packages, emails, etc.)
   -s URLS:   Extra substitute URLs for Guix (space separated).
              Example: 'http://192.168.1.2:8080'.
@@ -38,7 +38,7 @@ Environment variables:
   XDG_DATA_HOME=$XDG_DATA_HOME
   XDG_BIN_HOME=$XDG_BIN_HOME
 
-Tip:
+Tips:
 
 - Run the following command to install the Guix corresponding to your substitute
   server: