LWG3080 Floating point from_chars pattern specification breaks round-tripping

Author: jensmaurer

source/utilities.tex

@@ -29326,7 +29326,7 @@
 except that
 \begin{itemize}
 \item
-the only sign that may appear is \tcode{'-'};
+the sign '+' may only appear in the exponent part;
 \item
 if \tcode{fmt} has \tcode{chars_format::scientific} set
 but not \tcode{chars_format::fixed},