Docs: wording: functions -> algorithm

The code seems to provide a single function that implements the
CORDIC algorithm.

Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/lib/Kconfig b/lib/Kconfig
index 0bb69f6..d8c8a16 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -270,7 +270,7 @@
 	  If unsure, say N.
 
 config CORDIC
-	tristate "CORDIC function"
+	tristate "CORDIC algorithm"
 	help
 	  The option provides arithmetic function using CORDIC algorithm
 	  so its calculations are in fixed point. Modules can select this