Add VM name constraints to match those in vmctl.8 manpage.

Comments? Ok?

diff --git usr.sbin/vmd/vm.conf.5 usr.sbin/vmd/vm.conf.5
index d1e68dbce5d..77a7a4e8cea 100644
--- usr.sbin/vmd/vm.conf.5
+++ usr.sbin/vmd/vm.conf.5
@@ -108,7 +108,9 @@ section starts with a declaration of the virtual machine
 .Ar name :
 .Bl -tag -width Ds
 .It Ic vm Ar name Brq ...
-This name can be any string, and is typically a hostname.
+The name can be any alphanumeric string along with '.', '-', and '_'  
+characters.  However, it cannot start with '.', '-', or '_'.  
+Typically the name is a hostname.
 .El
 .Pp
 Followed by a block of parameters that is enclosed in curly brackets:
-- 
2.14.1

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