[perl/en] more perlish iterations on perl5 (#2489)

* more perlish iteration

c-style 'for' isn't perlish

* Update perl.html.markdown

removed one of the array iterator loops

perl.html.markdown

@@ -138,18 +138,16 @@ while (condition) {
 
 
 # for loops and iteration
-for (my $i = 0; $i < $max; $i++) {
+for my $i (0 .. $max) {
   print "index is $i";
 }
 
-for (my $i = 0; $i < @elements; $i++) {
-  print "Current element is " . $elements[$i];
-}
-
 for my $element (@elements) {
   print $element;
 }
 
+map {print} @elements;
+
 # implicitly
 
 for (@elements) {