Documentation: iio: Fix typo

Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/ABI/testing/sysfs-bus-iio

@@ -1290,7 +1290,7 @@ KernelVersion:	3.4
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Unit-less light intensity. Modifiers both and ir indicate
-		that measurements contains visible and infrared light
+		that measurements contain visible and infrared light
 		components or just infrared light, respectively. Modifier uv indicates
 		that measurements contain ultraviolet light components.