Change in '?' behavior is not reflected in the directory header

[Ken Brown]

In r6655 '?' was changed so that it no longer lists all commands.  But 
the directory header doesn't still says it does.  Here's the trivial patch:

Index: info/dir.c
===================================================================
--- info/dir.c  (revision 7037)
+++ info/dir.c  (working copy)
@@ -74,7 +74,7 @@
 "A few useful Info commands:\n"
 "\n"
 "  'q' quits;\n"
-"  '?' lists all Info commands;\n"
+"  'H' lists all Info commands;\n"
 "  'h' starts the Info tutorial;\n"
 "  'mTexinfo RET' visits the Texinfo manual, etc.\n"


Ken