fix Issue 6971 - [lex.dd] Type of string literals are outdated

lex.dd

@@ -487,17 +487,26 @@ $(V1 \x61"bc")
 	to the postfix characters are:
 	)
 
+$(V1
 	$(TABLE2 String Literal Postfix Characters,
-	$(THEAD Postfix, Type)
-	$(TROW $(B c), $(CODE char[]))
-	$(TROW $(B w), $(CODE wchar[]))
-	$(TROW $(B d), $(CODE dchar[]))
+	$(THEAD Postfix, Type, Aka)
+	$(TROW $(B c), $(D char[]), $(D string))
+	$(TROW $(B w), $(D wchar[]), $(D wstring))
+	$(TROW $(B d), $(D dchar[]), $(D dstring))
 	)
-
+)
+$(V2
+	$(TABLE2 String Literal Postfix Characters,
+	$(THEAD Postfix, Type, Aka)
+	$(TROW $(B c), $(D immutable(char)[]), $(D string))
+	$(TROW $(B w), $(D immutable(wchar)[]), $(D wstring))
+	$(TROW $(B d), $(D immutable(dchar)[]), $(D dstring))
+	)
+)
 ---
-"hello"c  // char[]
-"hello"w  // wchar[]
-"hello"d  // dchar[]
+"hello"c  // string
+"hello"w  // wstring
+"hello"d  // dstring
 ---
 
 	$(P The string literals are assembled as UTF-8 char arrays,