mbedtls_config.h: fix issue in grammar
Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 8acc377..9da7580 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -527,7 +527,7 @@
*
* Use only 128-bit keys in AES operations to save ROM.
*
- * Uncommenting this macro removes support for AES operations that are using 192
+ * Uncommenting this macro removes support for AES operations that use 192-
* or 256-bit keys.
*
* Tradeoff: Uncommenting this macro reduces ROM footprint by ~1116 bytes.