add fmt example output

[Dan Jacobson]

In the fmt info page, examples would be worth a 1000 words with
`--crown-margin',  `--tagged-paragraph'.

Mainly I wanted to turn
short line
LongLine....................
short line

into
short line
LongLine.......
   .............
short line
I.e., indentation after breaks. But no, there is no optional feature
to do that yet. The broken lines end up in column 1 indistinguishable
from the intact lines.

I don't know if you added that to fold(1) yet either.