btop: edit page (#12440)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/btop.md

@@ -11,3 +11,11 @@
 - Start `btop` with the specified settings preset:
 
 `btop --preset {{0..9}}`
+
+- Start `btop` in TTY mode using 16 colors and TTY-friendly graph symbols:
+
+`btop --tty_on`
+
+- Start `btop` in 256-color mode instead of 24-bit color mode:
+
+`btop --low-color`