Fixed some typos, courtesy of codespell

src/libstrongswan/crypto/mac.h

@@ -39,12 +39,12 @@ struct mac_t {
 	 *
 	 * If out is NULL, no result is given back.  A next call will
 	 * append the data to already supplied data.  If out is not NULL,
-	 * the mac of all apended data is calculated, written to out and the
+	 * the MAC of all appended data is calculated, written to out and the
 	 * internal state is reset.
 	 *
 	 * @param data		chunk of data to authenticate
 	 * @param out		pointer where the generated bytes will be written
-	 * @return			TRUE if mac generated successfully
+	 * @return			TRUE if MAC generated successfully
 	 */
 	bool (*get_mac)(mac_t *this, chunk_t data,
 					uint8_t *out) __attribute__((warn_unused_result));