Update config.h
Correction to the ECJPAKE_C note in config.h
*
* Enable the elliptic curve J-PAKE library.
*
+ * \note EC J-PAKE support is based on the Thread v1.0.0 specification.
+ * It has not been reviewed for compliance with newer standards such as
+ * Thread v1.1 or RFC 8236.
+ *
* Module: library/ecjpake.c
* Caller:
*
