[format.args] Move "Implementations should ..." part into Recommended practice paragraph

eisenwave · tkoeppe · commit 7eacc15f859c · 2025-11-17T16:21:00.000Z
diff --git a/source/text.tex b/source/text.tex
@@ -8721,6 +8721,9 @@
 \pnum
 An instance of \tcode{basic_format_args} provides access to formatting
 arguments.
+
+\pnum
+\recommended
 Implementations should
 optimize the representation of \tcode{basic_format_args}
 for a small number of formatting arguments.
