Update README.md

README.md

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 # The latest wirmware version from me - 2.9. Project is closed.
 ## Sourscode is available.
 ### Added the ability to turn off the display backlight by timer and indication of the power delivered to the antenna and the transmitter efficiency.
-This sells was added:  (for mini board, see the manual)
+These sells were added in 2.9 firmware for EXT board :
 30 – sell for setting the time of glow dysplay or its backlite, in seconds .
 The backlite is glowing whilw press any buttons and if RF power comes to input.П
 By default it is disabled, value 00.