docs: Updated manpage

docs/plistutil.1

@@ -26,6 +26,9 @@ format (like xml or json).
 If omitted, XML plist data will be converted to binary and vice-versa. To
 convert to/from JSON or OpenStep the output format needs to specified.
 .TP
+.B \-p, \-\-print FILE
+Print PList in human-readable format.
+.TP
 .B \-c, \-\-compact
 JSON and OpenStep only: Print output in compact form. By default, the output
 will be pretty-printed.