captype: add options to Usage: and man page

captype.c

@@ -47,7 +47,11 @@ static void
 print_usage(FILE *output)
 {
   fprintf(output, "\n");
-  fprintf(output, "Usage: captype <infile> ...\n");
+  fprintf(output, "Usage: captype [options] <infile> ...\n");
+  fprintf(output, "\n");
+  fprintf(output, "Miscellaneous:\n");
+  fprintf(output, "  -h, --help               display this help and exit\n");
+  fprintf(output, "  -v, --version            display version info and exit\n");
 }
 
 /*

doc/captype.adoc

@@ -13,6 +13,8 @@ captype - Prints the types of capture files
 
 [manarg]
 *captype*
+[ *-h* ]
+[ *-v* ]
 <__infile__>
 __...__
 
@@ -30,6 +32,20 @@ https://www.wireshark.org/docs/man-pages/wireshark.html
 is a detailed description of the way *Wireshark* handles this, which is
 the same way *Captype* handles this.
 
+== OPTIONS
+
+-h|--help::
++
+--
+Print the version number and options and exit.
+--
+
+-v|--version::
++
+--
+Print the full version information and exit.
+--
+
 == SEE ALSO
 
 xref:https://www.tcpdump.org/manpages/pcap.3pcap.html[pcap](3), xref:wireshark.html[wireshark](1), xref:mergecap.html[mergecap](1), xref:editcap.html[editcap](1), xref:tshark.html[tshark](1),