[lex.{phases,charset,string}] Fix minor misapplications of P2314R4 (#5040)

Corrects a grammar term plural form, adds missing "R" for raw string literal, and deletes a paragraph that was missed in the main commit (3505e2a) and adjust index entries.

Author: JohelEGP

source/lex.tex

@@ -117,7 +117,7 @@
 \grammarterm{r-char-sequence},
 \grammarterm{h-char-sequence}, or
 \grammarterm{q-char-sequence},
-\grammarterm{universal-character-names} are recognized and
+\grammarterm{universal-character-name}s are recognized and
 replaced by the designated element of the translation character set.
 The process of dividing a source file's
 characters into preprocessing tokens is context-dependent.
@@ -267,7 +267,7 @@
 U+003B & SEMICOLON & \tcode{;} \\
 U+003C & LESS-THAN SIGN & \tcode{<} \\
 U+003D & EQUALS SIGN & \tcode{=} \\
-U+003E & GREATER-THAN SIGN& \tcode{>} \\
+U+003E & GREATER-THAN SIGN & \tcode{>} \\
 U+003F & QUESTION MARK & \tcode{?} \\
 U+0041 .. U+005A & LATIN CAPITAL LETTER A .. Z & \tcode{A B C D E F G H I J K L M} \\
 & & \tcode{N O P Q R S T U V W X Y Z} \\
@@ -1825,7 +1825,7 @@
 (and not the single code unit \tcode{'\textbackslash xAB'}).
 Similarly,
 \begin{codeblock}
-"(\u00)" "41"
+R"(\u00)" "41"
 \end{codeblock}
 represents six characters,
 starting with a backslash and ending with the digit \tcode{1}
@@ -1855,14 +1855,6 @@
 \tcode{"a"}  & \tcode{L"b"} & \tcode{L"ab"} \\
 \end{floattable}
 
-\pnum
-\indextext{\idxcode{0}|seealso{zero, null}}%
-\indextext{\idxcode{0}!string terminator}%
-\indextext{\idxcode{0}!null character|see {character, null}}%
-In translation phase 6\iref{lex.phases},
-after adjacent \grammarterm{string-literal}s are concatenated,
-a null character is appended to the result.
-
 \pnum
 Evaluating a \grammarterm{string-literal} results in a string literal object
 with static storage duration\iref{basic.stc}.
@@ -1877,6 +1869,9 @@
 \end{note}
 
 \pnum
+\indextext{\idxcode{0}|seealso{zero, null}}%
+\indextext{\idxcode{0}!string terminator}%
+\indextext{\idxcode{0}!null character|see {character, null}}%
 String literal objects are initialized with
 the sequence of code unit values
 corresponding to the \grammarterm{string-literal}'s sequence of