install/51228: Explain the acronyms in sysinst config menu

[coypu%sdf.org@localhost]

>Number:         51228
>Category:       install
>Synopsis:       Explain the acronyms in sysinst config menu
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 09 03:10:00 +0000 2016
>Originator:     coypu
>Release:        NetBSD-7.99.30
>Organization:
>Environment:
NetBSD net.Home 7.99.30 NetBSD 7.99.30 (GENERIC) #2: Tue Jun  7 04:32:16 IDT 2016  fly%net.Home@localhost:/usr/obj/sys/arch/amd64/compile/GENERIC amd64
>Description:
meaning of "cgd", "mdnsd" etc. is not trivially obvious to everyone.
I think we have enough room to expand acronym to explain what it is.
>How-To-Repeat:

>Fix:
I didn't check if this is the right place to add it, but it seems like it is.
expanded some acronyms.
maybe write the acronym in parens rather than the expansion too...

diff --git a/usr.sbin/sysinst/configmenu.c b/usr.sbin/sysinst/configmenu.c
index 686ffa3..578ecbb 100644
--- a/usr.sbin/sysinst/configmenu.c
+++ b/usr.sbin/sysinst/configmenu.c
@@ -96,10 +96,10 @@ configinfo config_list[] = {
 	{MSG_enable_sshd, CONFIGOPT_SSHD, "sshd", toggle_rcvar, NULL},
 	{MSG_enable_ntpd, CONFIGOPT_NTPD, "ntpd", toggle_rcvar, NULL},
 	{MSG_run_ntpdate, CONFIGOPT_NTPDATE, "ntpdate", toggle_rcvar, NULL},
-	{MSG_enable_mdnsd, CONFIGOPT_MDNSD, "mdnsd", toggle_rcvar, NULL},
-	{MSG_enable_xdm, CONFIGOPT_XDM, "xdm", toggle_rcvar, NULL},
-	{MSG_enable_cgd, CONFIGOPT_CGD, "cgd", toggle_rcvar, NULL},
-	{MSG_enable_lvm, CONFIGOPT_LVM, "lvm", toggle_rcvar, NULL},
+	{MSG_enable_mdnsd, CONFIGOPT_MDNSD, "mdnsd (multicast and unicast DNS daemon)", toggle_rcvar, NULL},
+	{MSG_enable_xdm, CONFIGOPT_XDM, "xdm (X display manager)", toggle_rcvar, NULL},
+	{MSG_enable_cgd, CONFIGOPT_CGD, "cgd (cryptographic disk driver)", toggle_rcvar, NULL},
+	{MSG_enable_lvm, CONFIGOPT_LVM, "lvm (logical volume management)", toggle_rcvar, NULL},
 	{MSG_enable_raid, CONFIGOPT_RAIDFRAME, "raidframe", toggle_rcvar, NULL},
 	{MSG_add_a_user, CONFIGOPT_ADDUSER, NULL, add_new_user, ""},
 	{NULL,		CONFIGOPT_LAST,	NULL, NULL, NULL}