fixups: , in label id

Author: notadragon

source/expressions.tex

@@ -341,7 +341,7 @@
 If a pointer to $X$ would be valid in
 the context of the evaluation of the expression\iref{basic.fundamental},
 the result designates $X$;
-otherwise, the behavior is undefined.\ubdef{expr.type.reference,lifetime}
+otherwise, the behavior is undefined.\ubdef{expr.type.reference.lifetime}
 \begin{note}
 Before the lifetime of the reference has started or after it has ended,
 the behavior is undefined (see~\ref{basic.life}).

source/ub.tex

@@ -489,7 +489,7 @@
 \rSec2[ub.expr.type]{Type}
 
 \pnum
-\ubxref{expr.type.reference,lifetime} \\
+\ubxref{expr.type.reference.lifetime} \\
 Evaluating a reference when an equivalent use of a pointer denoting the same object
 would be invalid has undefined behavior.