Fix typo: missing space

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Author: ifdattic

components/console/helpers/dialoghelper.rst

@@ -236,7 +236,7 @@ this set the seventh argument to ``true``::
         true // enable multiselect
     );
 
-    $selectedColors = array_map(function($c) use ($colors) {
+    $selectedColors = array_map(function ($c) use ($colors) {
         return $colors[$c];
     }, $selected);