staging: iio: ad5933: change help rule message

Remove the previous comment about direct access via sysfs which would
lead one think ad5933 driver has limitations it actually doesn't.
Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/impedance-analyzer/Kconfig

@@ -10,7 +10,7 @@ config AD5933
 	select IIO_KFIFO_BUF
 	help
 	  Say yes here to build support for Analog Devices Impedance Converter,
-	  Network Analyzer, AD5933/4, provides direct access via sysfs.
+	  Network Analyzer, AD5933/4.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5933.