Added a space to maintain style consistency (#3892)

Author: BrandonPacewic

docs/standard-library/algorithm-functions.md

@@ -1227,7 +1227,7 @@ template<class T> void equal_range_demo( const vector<T>& original_vector, T val
 
     sort( v.begin(), v.end() );
     cout << "Vector sorted by the default binary predicate <:" << endl << '\t';
-    for (typename vector<T>::const_iterator i = v.begin(); i != v.end(); ++i )
+    for ( typename vector<T>::const_iterator i = v.begin(); i != v.end(); ++i )
     {
         cout << *i << " ";
     }