web: bd7910x: Try fixing the extra linefeed

Author: M-Vaittinen

_includes/bd7910x.md

@@ -68,7 +68,7 @@ The driver supports reading the ADC channels via the Linux IIO subsystem. SPI MO
             iovdd-supply = <&dummyreg>;
             spi-cpha;
             spi-cpol;
-{% if page.spifreq %}
+{%- if page.spifreq %}
             spi-max-frequency = <{{ page.spifreq }}>;
 {%- endif %}
         };