Minor reword

Author: javiereguiluz

components/console/helpers/progressbar.rst

@@ -95,22 +95,32 @@ that the progress bar display is refreshed with a 100% completion.
     :method:`Symfony\\Component\\Console\\Helper\\ProgressBar::display`
     to show the progress bar again.
 
-If you want to use the progress bar to show the progress of an iteration you can use the
-:method:`Symfony\\Component\\Console\\Helper\\ProgressBar::iterate` method that will automatically call ``start``,
-``advance`` and ``finish`` while iterating::
+If the progress information is stored in an iterable variable (such as an array
+or a PHP generator) you can use the
+:method:`Symfony\\Component\\Console\\Helper\\ProgressBar::iterate` method,
+which starts, advances and finishes the progress bar automatically::
 
     use Symfony\Component\Console\Helper\ProgressBar;
 
     $progressBar = new ProgressBar($output);
 
-    // starts and displays the progress bar
-    foreach ($progressBar->iterate($iterable) as $key => $value) {
+    // $iterable can be for example an array ([1, 2, 3, ...]) or a generator
+    // $iterable = function () { yield 1; yield 2; ... };
+    foreach ($progressBar->iterate($iterable) as $value) {
         // ... do some work
     }
 
+If ``$iterable = [1, 2]``, the previous code will output the following:
+
+.. code-block:: terminal
+
+     0/2 [>---------------------------]   0%
+     1/2 [==============>-------------]  50%
+     2/2 [============================] 100%
+
 .. versionadded:: 4.3
 
-    The ``iterate`` method was introduced in Symfony 4.3.
+    The ``iterate()`` method was introduced in Symfony 4.3.
 
 Customizing the Progress Bar
 ----------------------------