Improve wording in ECP documentation
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 06a3ce5..de3a343 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -499,8 +499,8 @@
* \brief This function frees the components of an ECP group.
*
* \param grp The group to free. This may be \c NULL, in which
- * case this function is a no-op. If it is not \c NULL,
- * it must point to an initialized ECP group.
+ * case this function returns immediately. If it is not
+ * \c NULL, it must point to an initialized ECP group.
*/
void mbedtls_ecp_group_free( mbedtls_ecp_group *grp );
@@ -508,8 +508,8 @@
* \brief This function frees the components of a key pair.
*
* \param key The key pair to free. This may be \c NULL, in which
- * case this function is a no-op. If it is not \c NULL,
- * it must point to an initialized ECP key pair.
+ * case this function returns immediately. If it is not
+ * \c NULL, it must point to an initialized ECP key pair.
*/
void mbedtls_ecp_keypair_free( mbedtls_ecp_keypair *key );
@@ -526,8 +526,8 @@
* \brief Free the components of a restart context.
*
* \param ctx The restart context to free. This may be \c NULL, in which
- * case this function is a no-op. If it is not \c NULL,
- * it must point to an initialized restart context.
+ * case this function returns immediately. If it is not
+ * \c NULL, it must point to an initialized restart context.
*/
void mbedtls_ecp_restart_free( mbedtls_ecp_restart_ctx *ctx );
#endif /* MBEDTLS_ECP_RESTARTABLE */