Fix Halibut syntax errors in the new shaping/bidi doc sections.

[originally from svn r4237]

doc/config.but

@@ -1,4 +1,4 @@
-\versionid $Id: config.but,v 1.78 2004/05/22 10:36:50 simon Exp $
+\versionid $Id: config.but,v 1.79 2004/05/22 11:04:35 simon Exp $
 
 \C{config} Configuring PuTTY
 
@@ -840,7 +840,7 @@ Arabic text shaping so that PuTTY displays precisely the characters
 it is told to display.
 
 You may also find you need to disable bidirectional text display;
-see \S{config-features-bidi}.
+see \k{config-features-bidi}.
 
 \S{config-features-bidi} Disabling bidirectional text display
 
@@ -861,7 +861,7 @@ bidirectional text display, so that PuTTY displays text from left to
 right in all situations.
 
 You may also find you need to disable Arabic text shaping;
-see \S{config-features-arabicshaping}.
+see \k{config-features-shaping}.
 
 \H{config-window} The Window panel