Update cheatsheets

tldr/btop

@@ -15,19 +15,19 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Start `btop` with the specified settings preset:
 
-`btop --preset {{0..9}}`
+`btop {{[-p|--preset]}} {{0..9}}`
 
 - Start `btop` in TTY mode using 16 colors and TTY-friendly graph symbols:
 
-`btop --tty_on`
+`btop {{[-t|--tty]}}`
 
 - Start `btop` in 256-color mode instead of 24-bit color mode:
 
-`btop --low-color`
+`btop {{[-l|--low-color]}}`
 
 - Set the update rate to 500 milliseconds:
 
-`btop --update 500`
+`btop {{[-u|--update]}} 500`
 
 - Exit `btop`: