[cmp.alg] Add missing formatting for F (#6243)

Author: frederick-vs-ja

source/support.tex

@@ -4949,7 +4949,7 @@
 \pnum
 The name \tcode{compare_strong_order_fallback}
 denotes a customization point object\iref{customization.point.object}.
-Given subexpressions \tcode{E} and {F},
+Given subexpressions \tcode{E} and \tcode{F},
 the expression \tcode{compare_strong_order_fallback(E, F)}
 is expression-equivalent\iref{defns.expression.equivalent} to:
 \begin{itemize}