[class.compare] Don't introduce V for the return value (#6035)

In both cases, I'm not sure introducing `V` helps much - just requires name lookup for `V`. If we just say "the return value" in every case, I think that's clearer.

source/classes.tex

@@ -6503,16 +6503,16 @@
 is usable\iref{class.compare.default}.
 
 \pnum
-The return value \tcode{V} of a defaulted \tcode{==} operator function
+The return value of a defaulted \tcode{==} operator function
 with parameters \tcode{x} and \tcode{y} is determined
 by comparing corresponding elements $\tcode{x}_i$ and $\tcode{y}_i$
 in the expanded lists of subobjects for \tcode{x} and \tcode{y}
 (in increasing index order)
 until the first index $i$
 where $\tcode{x}_i\tcode{ == }\tcode{y}_i$ yields a result value which,
 when contextually converted to \tcode{bool}, yields \tcode{false}.
-If no such index exists, \tcode{V} is \tcode{true}.
-Otherwise, \tcode{V} is \tcode{false}.
+The return value is \tcode{true} if such an index exists
+and \tcode{false} otherwise.
 
 \pnum
 \begin{example}
@@ -6611,7 +6611,7 @@
 \end{itemize}
 
 \pnum
-The return value \tcode{V} of type \tcode{R}
+The return value of type \tcode{R}
 of the defaulted three-way comparison operator function
 with parameters \tcode{x} and \tcode{y} of the same type
 is determined by comparing corresponding elements
@@ -6622,10 +6622,10 @@
 the synthesized three-way comparison of type \tcode{R}
 between $\tcode{x}_i$ and $\tcode{y}_i$
 yields a result value $\tcode{v}_i$ where $\tcode{v}_i \mathrel{\tcode{!=}} 0$,
-contextually converted to \tcode{bool}, yields \tcode{true};
-\tcode{V} is a copy of $\tcode{v}_i$.
-If no such index exists, \tcode{V} is
-\tcode{static_cast<R>(std::strong_ordering::equal)}.
+contextually converted to \tcode{bool}, yields \tcode{true}.
+The return value is a copy of $\tcode{v}_i$
+if such an index exists and
+\tcode{static_cast<R>(std::strong_ordering::equal)} otherwise.
 
 \pnum
 The \defn{common comparison type} \tcode{U}