Adopt the comment for tcp_maxmtu(); we are returning a number not a pointer. While here update the rest of the comment to better match what we have these days.
Adopt the comment for tcp_maxmtu(); we are returning a number
not a pointer. While here update the rest of the comment to
better match what we have these days.

MFC after:	2 months

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase