(Categories): Add index entries.

lispref/ChangeLog

+2007-02-02  Eli Zaretskii  <eliz@gnu.org>
+
+	* syntax.texi (Categories): Add index entries.
+
 2007-02-01  Juanma Barranquero  <lekktu@gmail.com>
 
 	* display.texi (Attribute Functions): Fix name and description of

lispref/syntax.texi

@@ -1041,6 +1041,7 @@ class codes.
 @node Categories
 @section Categories
 @cindex categories of characters
+@cindex character categories
 
   @dfn{Categories} provide an alternate way of classifying characters
 syntactically.  You can define several categories as needed, then
@@ -1048,6 +1049,7 @@ independently assign each character to one or more categories.  Unlike
 syntax classes, categories are not mutually exclusive; it is normal for
 one character to belong to several categories.
 
+@cindex category table
   Each buffer has a @dfn{category table} which records which categories
 are defined and also which characters belong to each category.  Each
 category table defines its own categories, but normally these are