zunitc: Fix minor typo

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/tools/zunitc/inc/zunitc/zunitc.h b/tools/zunitc/inc/zunitc/zunitc.h
index fc6ee1c..d8c3cb0 100644
--- a/tools/zunitc/inc/zunitc/zunitc.h
+++ b/tools/zunitc/inc/zunitc/zunitc.h
@@ -174,7 +174,7 @@
 
 /**
  * Displays all known tests.
- * The list returned is affected to any filtering in place.
+ * The list returned is affected by any filtering in place.
  *
  * @see zuc_set_filter()
  */