zgetdump: Update the man page

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zdump/zgetdump.8

@@ -1,4 +1,4 @@
-.\" Copyright 2017 IBM Corp.
+.\" Copyright 2018 IBM Corp.
 .\" s390-tools is free software; you can redistribute it and/or modify
 .\" it under the terms of the MIT license. See LICENSE for details.
 .\"
@@ -59,6 +59,12 @@ more information.
 Print the dump header information reading from the DUMP and check if
 the dump is valid. See chapters DUMP and DUMP INFORMATION below for more
 information.
+
+.TP
+.BR "\-V" " or " "\-\-verbose"
+Show the detailed memory map layout when printing the dump header
+information (relevant for s390_ext and ELF dump formats).
+
 .TP
 .BR "\-f <FMT>" " or " "\-\-fmt <FMT>"
 Use the specified target dump format FMT when writing or mounting the dump.
@@ -170,6 +176,9 @@ This dump format is System z specific and is used for DASD and tape dumps.
 .TP
 The following dump formats are supported for the source dump only:
 .TP
+.BR "s390_ext"
+This dump format is System z specific and is used for DASD dumps only.
+.TP
 .BR "lkcd"
 This dump format is used by the Linux Kernel Crash Dumps (LKCD) project
 and also on System z for the "vmconvert" dump tool.
@@ -245,6 +254,10 @@ The "real memory range" can differ from the "dump memory range" when
 the SIZE parameter was used when preparing the dump device with the zipl
 tool (see man zipl).
 .TP
+.BR "Dump file size"
+Actual size of dump file on disk in megabytes. "Dump file size" may differ from
+the "dump memory range" because of zero memory chunks.
+.TP
 .BR "Memory map"
 Available memory chunks in the dump. Some dump tools create multiple memory
 chunks when creating a dump on a system with memory gaps