[expr.new] Precise cross-reference for throwing exceptions (#8681)

Author: AlisdairM

source/expressions.tex

@@ -6259,7 +6259,7 @@
 \indextext{\idxcode{bad_alloc}}%
 \indexlibraryglobal{bad_alloc}%
 \tcode{std::bad_alloc}
-exception\iref{basic.stc.dynamic.allocation,except,bad.alloc};
+exception\iref{basic.stc.dynamic.allocation,except.throw,bad.alloc};
 it returns a non-null pointer otherwise. If the allocation function
 has a non-throwing exception specification,
 it returns null to indicate failure to allocate storage