stunnel: fix long help text lines

And add homepage while we're at it.

package/stunnel/Config.in

@@ -1,4 +1,9 @@
 config BR2_PACKAGE_STUNNEL
 	bool "stunnel"
 	help
-	  Stunnel is a utility that utilised OpenSSL to wrap plaintext TCP communications with SSL. Can be used to secure a programmes insecure network communications.
+	  Stunnel is a utility that utilised OpenSSL to wrap plaintext
+	  TCP communications with SSL. Can be used to secure a
+	  programmes insecure network communications.
+
+	  http://www.stunnel.org/
+