Adjust documentation of mbedtls_cipher_update_ad
Fix indentation and capitalization
@@ -682,7 +682,7 @@ int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx );
* \param ctx The generic cipher context. This must be initialized.
* \param ad The additional data to use. This must be a readable
* buffer of at least \p ad_len Bytes.
- * \param ad_len the Length of \p ad Bytes.
+ * \param ad_len The Length of \p ad Bytes.
*
* \return \c 0 on success.
* \return A specific error code on failure.
