Remove or fix outdated comments
Remove or fix outdated comments

Preparatory to the tabbing coming up, remove some old code comments.
They are better understood in their original context anyway.

The "fix": Describe (not refer to by name) the mold buffer, in two comments.

hostilefork/rebol,codebybrett/ren-c,hostilefork/rebol,kealist/ren-c,kealist/ren-c,giuliolunati/ren-c,giuliolunati/ren-c,draegtun/ren-c,giuliolunati/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,draegtun/ren-c,draegtun/ren-c,hostilefork/rebol,draegtun/ren-c,codebybrett/ren-c,draegtun/ren-c,giuliolunati/ren-c,codebybrett/ren-c,rgchris/ren-c,kealist/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,hostilefork/rebol,giuliolunati/ren-c,codebybrett/ren-c,rgchris/ren-c,draegtun/ren-c,hostilefork/rebol