mktables: White-space, comments only

mktables: White-space, comments only

A previous commit has added two nested blocks surrounding the affected
code.  This looks like a big change, but it is in fact only white space
plus reflowing things to fit in an 80 column window, plus slight changes
to comments.

I verified that there were no code changes by using a diff command that
can ignore leading white space changes, and hence gave a more accurate
difference listing