[metapost] Fix formatting glitches.

[Andreas Scherer]

Am 12.05.24 um 14:51 schrieb Andreas Scherer:
> And half a radio interview later, here are the "final" patches for MP.W.

Scrolling through MP.PDF a second time from Section 1 to the Index 
produces another set of fixes sprinkled all over the document.

Happy hacking!
Andreas
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