Comment refers to MAX_MTU_SIZE which is not defined anywhere

[Imagix]

The comment on writeTo claims that its parameter points to a buffer that is MAX_MTU_SIZE in length, but MAX_MTU_SIZE does not appear to be defined anywhere.

MeshCore/src/Packet.h

Line 101 in 03b6ef4

* \param dest (OUT) destination buffer (assumed to be MAX_MTU_SIZE)