[formatter.requirements] Remove one level of list nesting

Author: tkoeppe

source/utilities.tex

@@ -15655,9 +15655,7 @@
 \rSec3[formatter.requirements]{Formatter requirements}
 
 \pnum
-A type \tcode{F} meets the \defnnewoldconcept{BasicFormatter} requirements if:
-\begin{itemize}
-\item
+A type \tcode{F} meets the \defnnewoldconcept{BasicFormatter} requirements if
 it meets the
 \begin{itemize}
 \item \oldconcept{DefaultConstructible} (\tref{cpp17.defaultconstructible}),
@@ -15667,11 +15665,8 @@
 \item \oldconcept{Destructible} (\tref{cpp17.destructible})
 \end{itemize}
 requirements, and
-
-\item
 the expressions shown in \tref{formatter.basic} are valid and
 have the indicated semantics.
-\end{itemize}
 
 \pnum
 A type \tcode{F} meets the \defnnewoldconcept{Formatter} requirements