update English usage in message templates

r4048

debian/netcfg-dhcp.templates

@@ -1,10 +1,9 @@
 Template: netcfg/dhcp_hostname
 Type: string
 _Description: What is your dhcp hostname?
- In some situations, you may need to supply a DHCP host name.  These
- situations are rare.  Most commonly, it applies to cable modem users. If
- you are a cable modem user, you might need to specify an account number
- here.  Otherwise, you can just leave this blank.
+ You may need to supply a DHCP host name. If you are using 
+ a cable modem, you might need to specify an account number
+ here.  Most other users can just leave this blank.
 
 Template: netcfg/confirm_dhcp
 Type: boolean