FIXUP LWG4015: Break line after comma as suggested in review.

Author: burblebee

source/utilities.tex

@@ -3970,7 +3970,8 @@
 
 \pnum
 \remarks
-If an exception is thrown during the call to \tcode{T}'s constructor, \tcode{*this} does not contain a value, and
+If an exception is thrown during the call to \tcode{T}'s constructor,
+\tcode{*this} does not contain a value, and
 the previous \exposid{val} (if any) has been destroyed.
 \end{itemdescr}