Document undocumented "-" behavior

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Bert Münnich 2018-12-29 19:03:34 +01:00
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sxiv.1
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@ -72,7 +72,7 @@ Start at picture number NUM.
Print brief usage information to standard output and exit.
.TP
.B \-i
Read names of files to open from standard input.
Read names of files to open from standard input. Also done if FILE is `-'.
.TP
.B \-o
Write list of all marked files to standard output when quitting. In combination