Correct pluralisation errors in comments

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h
index 12b3506..a07c8a5 100644
--- a/include/mbedtls/aes.h
+++ b/include/mbedtls/aes.h
@@ -35,7 +35,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
-/* aesni.c rely on these values! */
+/* aesni.c relies on these values! */
 #define MBEDTLS_AES_ENCRYPT     1 /**< AES encryption. */
 #define MBEDTLS_AES_DECRYPT     0 /**< AES decryption. */
 
diff --git a/library/aes.c b/library/aes.c
index f615267..ae883b2 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -972,7 +972,7 @@
 #endif /* !MBEDTLS_AES_DECRYPT_ALT && !MBEDTLS_BLOCK_CIPHER_NO_DECRYPT */
 
 /*
- * Our intrinsics-based implementation of AESNI require the round keys to be
+ * Our intrinsics-based implementation of AESNI requires the round keys to be
  * aligned on a 16-byte boundary. We take care of this before creating them,
  * but the AES context may have moved (this can happen if the library is
  * called from a language with managed memory), and in later calls it might