Remove nested comment from pawn example.
Remove nested comment from pawn example.

This has been causing a number of failing tests, and I find no evidence in half
an hour of searching online that nested comments are actually supported (an
example state machine in Pawn_Language_Guide.pdf doesn't; and says it's based on
C which doesn't.

I haven't tried the Pawn compiler itself, but to support nested comments better
will require adjusting other patterns as well.

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