reference_hardware: Fix typo in imx6q sabrelite setup

Remove duplicated words.

content/reference_hardware/imx6q_sabrelite_setup.md

@@ -64,8 +64,8 @@ programmed onto the SD card.
 - Remove the SD card and power off the board.
 - [Download]({{< ref "download.md" >}}) and program the required image onto the
   SD card.
-- Insert the SD card into the into the full SD card slot on the rear of the
-  board, labelled `SD3` **not** the MicroSD card slot on the front labelled
+- Insert the SD card into the full SD card slot on the rear of the board,
+  labelled `SD3` **not** the MicroSD card slot on the front labelled
   `SD4/BOOT`.
 - Power up the SABRE Lite.