Improve description as suggested by Greg A. Woods in PR pkg/19099.

net/bind9/DESCR

@@ -1,14 +1,19 @@
-  BIND version 9 is a major rewrite of nearly all aspects of the
-underlying BIND architecture. This re-architecting of BIND was
-necessitated by the expected demands of:
-
-  - Domain name system growth, particularly in very large
-    zones such as .COM
-  - Protocol enhancements necessary to securely query and
-    update zones
-  - Protocol enhancements necessary to take advantage of
-    certain architectural features of IP version 6
-
-  The 9.0.0 release, and this release candidate, is aimed at
-early adopters and those who wish to make use of new 9.0
-features, such as IPv6 and DNSSEC secure resolution support.
+    BIND, the Berkeley Internet Name Daemon, version 9 is a major
+rewrite of nearly all aspects of the underlying BIND architecture.  Some
+of the important features of BIND-9 are:
+	- DNS Security
+		DNSSEC (signed zones)
+		TSIG (signed DNS requests)
+	- IP version 6
+		Answers DNS queries on IPv6 sockets
+	  	IPv6 resource records (A6, DNAME, etc.)
+		Bitstring Labels
+		Experimental IPv6 Resolver Library
+	- DNS Protocol Enhancements
+		IXFR, DDNS, Notify, EDNS0
+		Improved standards conformance
+	- Views
+		One server process can provide multiple "views" of the
+		DNS namespace to different clients.
+	- Multiprocessor Support
+	- Improved Portability Architecture