[lex.charset] Introduced parent [lax.char] clause for character sets and UCNs

Author: AlisdairM

source/lex.tex

@@ -243,7 +243,9 @@
 \indextext{translation!phases|)}
 \end{enumerate}
 
-\rSec1[lex.charset]{Character sets}
+\rSec1[lex.char]{Characters}%
+
+\rSec2[lex.charset]{Character sets}
 
 \pnum
 \indextext{character set|(}%
@@ -379,7 +381,7 @@
 for the respective Unicode encoding form.
 \indextext{character set|)}
 
-\rSec1[lex.universal.char]{Universal Character Names}
+\rSec2[lex.universal.char]{Universal character names}
 
 \begin{bnf}
 \nontermdef{n-char}\br