hush: use FEATURE_SH_NOFORK to enable NOFORK trick

Also expands docs

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/Config.src b/shell/Config.src
index c9c2439..e96c216 100644
--- a/shell/Config.src
+++ b/shell/Config.src
@@ -123,9 +123,9 @@
 	default n
 	depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
 	help
-	  This option causes busybox shells [currently only ash]
-	  to not execute typical fork/exec/wait sequence, but call <applet>_main
-	  directly, if possible. (Sometimes it is not possible: for example,
+	  This option causes busybox shells to not execute typical
+	  fork/exec/wait sequence, but call <applet>_main directly,
+	  if possible. (Sometimes it is not possible: for example,
 	  this is not possible in pipes).
 
 	  This will be done only for some applets (those which are marked
@@ -133,6 +133,7 @@
 
 	  This may significantly speed up some shell scripts.
 
-	  This feature is relatively new. Use with care.
+	  This feature is relatively new. Use with care. Report bugs
+	  to project mailing list.
 
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