minor #11316 Minor improvement in the DomCrawler + HTML5 explanation (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #11316).

Discussion
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Minor improvement in the DomCrawler + HTML5 explanation

Minor improvement according to @tgalopin comments in symfony/symfony#30892.

Commits
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1c7eb79 Minor improvement in the DomCrawler + HTML5 explanation

Author: wouterj

components/dom_crawler.rst

@@ -74,7 +74,8 @@ tree.
 
     If you need better support for HTML5 contents or want to get rid of the
     inconsistencies of PHP's DOM extension, install the `html5-php library`_.
-    The DomCrawler component uses it automatically when available.
+    The DomCrawler component will use it automatically when the content has
+    an HTML5 doctype.
 
     .. versionadded:: 4.3