dts: bindings: mipi-dbi-spi: fix language describing duplex

Update language describing mipi dbi spi duplex to be more clear.
Removing a run-on sentence.

Signed-off-by: Stephan Linz <linz@li-pro.net>

Author: rexut

dts/bindings/mipi-dbi/mipi-dbi-spi-device.yaml

@@ -14,7 +14,7 @@ properties:
       as this is, by far, the most common mode.
       Selecting half duplex allows to use SPI MOSI as a bidirectional line,
       typically used when only one data line is connected.
-      Use the macros not the actual enum value, here is the concordance
+      Use the macros, not the actual enum value. Here is the concordance
       list (see dt-bindings/spi/spi.h)
         0    SPI_FULL_DUPLEX
         2048 SPI_HALF_DUPLEX