Direct commit for some clarification/correction

Direct commit for some clarification/correction

The notice in UPDATING stated the wrong direction for the link.

Additionally, it's decidedly not a bad idea to throw in a comment mandating
that the ordering of LOADER_DEFAULT_INTERP bits remains the same in this
branch. This makes it even more obvious from diff review (against head) that
this difference is intentional and creates merge conflicts if someone tries
to apply the original commit manually.  I suspect this won't be a problem
given the set of people that maintain loader bits in stable/11, but it does
offer a peace of mind.

Reported by:	rgrimes