Update RFC6775 references to RFC8505

Pascal Thubert wrote (https://mailarchive.ietf.org/arch/msg/6tisch/foP80MdcioJExxsy9blOnX89NUY):

Section 4.2:
“                 The pledge MAY perform the Neighbor
   Solicitation / Neighbor Advertisement exchange with the JP, as per
   Section 5.5.1 of [RFC6775]. 
“

This reference is outdated. I suggest referring to section 5.6. of [RFC8505].

‌

Section 6:

‌

Again a ref to RFC 6775. In a general manner please use RFC 8505.

Comments (2)