[alg.merge] Add a linebreak hint

to avoid an overfull hbox.

Author: jensmaurer

source/algorithms.tex

@@ -4394,10 +4394,10 @@
 The resulting range shall not overlap with either of the original ranges.
 
 \pnum
-\effects\ Copies all the elements of the two ranges \range{first1}{last1} and
+\effects Copies all the elements of the two ranges \range{first1}{last1} and
 \range{first2}{last2} into the range \range{result}{result_last}, where \tcode{result_last}
 is \tcode{result + (last1 - first1) + (last2 - first2)}, such that the resulting range satisfies
-\tcode{is_sorted(result, result_last)} or \tcode{is_sorted(result, result_last, comp)}, respectively.
+\tcode{is_sorted(result, result_last)} or \tcode{is_sorted(\brk{}result, result_last, comp)}, respectively.
 
 \pnum
 \returns