termux-notification: document one-letter options

Author: xalexalex

scripts/termux-notification

@@ -13,9 +13,10 @@ show_usage () {
     echo "  --button2-action action  action to execute on the second notification button"
     echo "  --button3 text           text to show on the third notification button"
     echo "  --button3-action action  action to execute on the third notification button"
-    echo "  --content content        content to show in the notification. Will take precedence over stdin."
+    echo "  -c/--content content     content to show in the notification. Will take precedence over stdin."
     echo "  --group group            notification group (notifications with the same group are shown together)"
-    echo "  --id id                  notification id (will overwrite any previous notification with the same id)"
+    echo "  -h/--help                show this help"
+    echo "  -i/--id id               notification id (will overwrite any previous notification with the same id)"
     echo "  --image-path path        absolute path to an image which will be shown in the notification"
     echo "  --led-color rrggbb       color of the blinking led as RRGGBB (default: none)"
     echo "  --led-off milliseconds   number of milliseconds for the LED to be off while it's flashing (default: 800)"
@@ -24,7 +25,7 @@ show_usage () {
     echo "  --ongoing                pin the notification"
     echo "  --priority prio          notification priority (high/low/max/min/default)"
     echo "  --sound                  play a sound with the notification"
-    echo "  --title title            notification title to show"
+    echo "  -t/--title title         notification title to show"
     echo "  --vibrate pattern        vibrate pattern, comma separated as in 500,1000,200"
     echo "  --type type              notification style to use (default/media)"
     echo "Media actions (available with --type \"media\"):"