minor #3168 [TwigComponent] Fix typo in documentation (alvidias)

This PR was merged into the 2.x branch.

Discussion
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[TwigComponent] Fix typo in documentation

| Q              | A
| -------------- | ---
| Bug fix?       | no
| New feature?   | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations?  | no <!-- if yes, also update UPGRADE-*.md and src/**/CHANGELOG.md -->
| Documentation? | yes <!-- required for new features, or documentation updates -->
| Issues         | 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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Replace this notice by a description of your feature/bugfix.
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Additionally (see https://symfony.com/releases):
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 - For new features, provide some code snippets to help understand usage.
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Small typo fix in documentation.

Commits
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5cc50da fix: add missing closing quote to attribute

Author: Kocal

src/TwigComponent/doc/index.rst

@@ -727,7 +727,7 @@ Examples of usage:
     <twig:Button icon="share">Share</twig:Button>
 
     {# both properties "icon" and "type" are passed #}
-    <twig:Button icon="share" type="secondary>Share</twig:Button>
+    <twig:Button icon="share" type="secondary">Share</twig:Button>
 
 .. _embedded-components: