minor #315 Typo in code $variables['custom'] => 'value'; (htmlshaman1)

This PR was merged into the 2.x branch.

Discussion
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Typo in code $variables['custom'] => 'value';

$variables['custom'] => 'value' is a typo, should read $variables['custom'] = 'value';

| Q             | A
| ------------- | ---
| Bug fix?      | yes/no
| New feature?  | yes/no <!-- please update src/**/CHANGELOG.md files -->
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

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Commits
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4333ead Typo in code $variables['custom'] => 'value';

Author: kbond

src/TwigComponent/src/Resources/doc/index.rst

@@ -623,7 +623,7 @@ the twig template and twig variables before components are rendered::
 
         // manipulate the variables:
         $variables = $event->getVariables();
-        $variables['custom'] => 'value';
+        $variables['custom'] = 'value';
 
         $event->setVariables($variables); // {{ custom }} will be available in your template
     }