[gram, gram.key, lex.ppnumber] Use \indextext instead of \index.

Author: Eelis

source/grammar.tex

@@ -3,8 +3,8 @@
 \begin{paras}
 
 \pnum
-\index{grammar}%
-\index{summary, syntax}%
+\indextext{grammar}%
+\indextext{summary!syntax}%
 This summary of \Cpp\  syntax is intended to be an aid to comprehension.
 It is not an exact statement of the language.
 In particular, the grammar described here accepts
@@ -17,7 +17,7 @@
 \rSec1[gram.key]{Keywords}
 
 \pnum
-\index{keyword}%
+\indextext{keyword}%
 New context-dependent keywords are introduced into a program by
 \tcode{typedef}~(\ref{dcl.typedef}),
 \tcode{namespace}~(\ref{namespace.def}),

source/lex.tex

@@ -484,7 +484,7 @@
 
 \rSec1[lex.ppnumber]{Preprocessing numbers}
 
-\index{number!preprocessing|(}%
+\indextext{number!preprocessing|(}%
 \begin{bnf}
 \nontermdef{pp-number}\br
     digit\br
@@ -507,7 +507,7 @@
 A preprocessing number does not have a type or a value; it acquires both
 after a successful conversion to an integer literal token or a floating literal
 token.%
-\index{number!preprocessing|)}
+\indextext{number!preprocessing|)}
 
 \rSec1[lex.name]{Identifiers}