docs: fix simple typo, succes -> success

There is a small typo in src/mac/f9/f9_test.c, src/mac/xcbc/xcbc_test.c.

Should read `success` rather than `succes`.

src/mac/f9/f9_test.c

@@ -10,7 +10,7 @@
 #ifdef LTC_F9_MODE
 
 /** Test f9-MAC mode
-  Return CRYPT_OK on succes
+  Return CRYPT_OK on success
 */
 int f9_test(void)
 {

src/mac/xcbc/xcbc_test.c

@@ -10,7 +10,7 @@
 #ifdef LTC_XCBC
 
 /** Test XCBC-MAC mode
-  Return CRYPT_OK on succes
+  Return CRYPT_OK on success
 */
 int xcbc_test(void)
 {