[iterator.traits] Whitespace improvements in example

Author: tkoeppe

source/iterators.tex

@@ -1131,12 +1131,10 @@
 \begin{codeblock}
 template<class BI>
 void reverse(BI first, BI last) {
-  typename iterator_traits<BI>::difference_type n =
-    distance(first, last);
+  typename iterator_traits<BI>::difference_type n = distance(first, last);
   --n;
-  while(n > 0) {
-    typename iterator_traits<BI>::value_type
-     tmp = *first;
+  while (n > 0) {
+    typename iterator_traits<BI>::value_type tmp = *first;
     *first++ = *--last;
     *last = tmp;
     n -= 2;