Improve wording in documentation of MBEDTLS_SSL_CID
*
* Setting this option enables the SSL APIs `mbedtls_ssl_set_cid()`,
* `mbedtls_ssl_get_peer_cid()` and `mbedtls_ssl_conf_cid()`.
- * See their documentation for more information.
+ * See the corresponding documentation for more information.
*
* \warning The Connection ID extension is still in draft state.
* We make no stability promises for the availability
