[utilities] Move chars_format bitmask statement to [charconv.syn] (#1992)

Author: jensmaurer

source/utilities.tex

@@ -182,14 +182,6 @@
 that are described in this Clause. It also defines the template \tcode{pair}
 and various function templates that operate on \tcode{pair} objects.
 
-\pnum
-The type \tcode{chars_format}
-is a bitmask type\iref{bitmask.types}
-with elements
-\tcode{scientific},
-\tcode{fixed},
-and \tcode{hex}.
-
 \rSec2[utility.swap]{\tcode{swap}}
 
 \indexlibrary{\idxcode{swap}}%
@@ -29081,6 +29073,10 @@
 }
 \end{codeblock}
 
+\pnum
+The type \tcode{chars_format} is a bitmask type\iref{bitmask.types}
+with elements \tcode{scientific}, \tcode{fixed}, and \tcode{hex}.
+
 \rSec2[charconv.to.chars]{Primitive numeric output conversion}
 
 \pnum