/usr/share/doc/ircd-ratbox/server-version-info is in ircd-ratbox 3.0.8.dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 |                               Server VERSION Info
   $Id: server-version-info 27381 2012-03-16 23:10:29Z dubkat $
   Copyright (c) 2001 by ircd-hybrid team
   Copyright (c) 2002-2012 ircd-ratbox development team
     ----------------------------------------------------------------------
   When you type /version, you will often see something like this:
 ircd-ratbox-1.0rc7(20021120_0). embers.lan egGHIKMpZ6 TS5ow
   Ever wondered what those funny chars mean after the version number? Well
   here they are:
   +----------------------------+
   | 'e'  | USE_EXCEPT          |
   |------+---------------------|
   | 'g'  | NO_FAKE_GLINES      |
   |------+---------------------|
   | 'G'  | GLINES              |
   |------+---------------------|
   | 'H'  | HUB                 |
   |------+---------------------|
   | 'I'  | USE_INVEX           |
   |------+---------------------|
   | 'K'  | USE_KNOCK           |
   |------+---------------------|
   | 'M'  | IDLE_FROM_MSG       |
   |------+---------------------|
   | 'p'  | CRYPT_OPER_PASSWORD |
   |------+---------------------|
   | 'Z'  | ZIPLINKS            |
   |------+---------------------|
   | '6'  | IPv6                |
   |------+---------------------|
   |      |                     |
   |------+---------------------|
   | 'TS' | Supports TS         |
   |------+---------------------|
   | '5'  | TS Version 5        |
   |------+---------------------|
   | 'o'  | TS Only             |
   |------+---------------------|
   | 'w'  | TS Warnings         |
   +----------------------------+
 |