LWG3721 Allow an arg-id with a value of zero for width in std-format-spec

Author: burblebee

source/utilities.tex

@@ -13833,9 +13833,7 @@
 a \fmtgrammarterm{width} or \fmtgrammarterm{precision},
 the value of the corresponding formatting argument is used in its place.
 If the corresponding formatting argument is not of integral type, or
-its value is
-negative for \fmtgrammarterm{precision} or
-non-positive for \fmtgrammarterm{width},
+its value is negative,
 an exception of type \tcode{format_error} is thrown.
 
 \pnum