minor symfony#8040 Fix comment to be consistent with the example (yceruto)

This PR was merged into the 2.7 branch.

Discussion
----------

Fix comment to be consistent with the example

Commits
-------

2bc6010 Fix comment to be consistent with the example

Author: xabbuh

form/type_guesser.rst

@@ -136,7 +136,7 @@ With this knowledge, you can easily implement the ``guessType()`` method of the
             $phpdoc = $reflectionProperty->getDocComment();
 
             // parse the $phpdoc into an array like:
-            // array('type' => 'string', 'since' => '1.0')
+            // array('var' => 'string', 'since' => '1.0')
             $phpdocTags = ...;
 
             return $phpdocTags;