Docs: Kconfig: CORDIC description

This is just some copyediting.
Signed-off-by: NMichael Witten <mfwitten@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

lib/Kconfig

@@ -272,9 +272,8 @@ config AVERAGE
 config CORDIC
 	tristate "CORDIC algorithm"
 	help
-	  The option provides arithmetic function using CORDIC algorithm
-	  so its calculations are in fixed point. Modules can select this
-	  when they require this function. Module will be called cordic.
+	  This option provides an implementation of the CORDIC algorithm;
+	  calculations are in fixed point. Module will be called cordic.
 
 config LLIST
 	bool