[locale.codecvt.virtuals] Improve wording

Author: cpplearner

Diff for: source/text.tex

@@ -2161,10 +2161,8 @@
 It always leaves the \tcode{from_next} and \tcode{to_next} pointers
 pointing one beyond the last element successfully converted.
 If it returns \tcode{noconv},
-\tcode{internT} and \tcode{externT} are the same type, and
-the converted sequence is identical to
-the input sequence \range{from}{from\textunderscore\nobreak next},
 \tcode{to_next} is set equal to \tcode{to},
+\tcode{from_next} is set equal to \tcode{from},
 the value of \tcode{state} is unchanged, and
 there are no changes to the values in \range{to}{to_end}.