Edit variable-length array example

The current example seems to be trying to set a size for a char buffer,
use fgets to populate that buffer, and then use strtoul to convert the
char content to an unsigned integer. However, this doesn't work as
intended (in fact, it results in printing "sizeof array = 0"), and so
adapt to a simpler fscanf example. Also remove some ambiguous language
in the example output.

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