Fix busted texi from last night.

Author: graydon

doc/rust.texi

@@ -2807,8 +2807,10 @@ structure of expressions. Blocks themselves are expressions, so the nesting
 sequence of block, statement, expression, and block can repeatedly nest to an
 arbitrary depth.
 
+@menu
 * Ref.Stmt.Decl::               Statement declaring an item or slot.
 * Ref.Stmt.Expr::               Statement evaluating an expression.
+@end menu
 
 @node       Ref.Stmt.Decl
 @subsection Ref.Stmt.Decl