feature #13054 [DomCrawler] Document UriResolver (lyrixx)

This PR was squashed before being merged into the master branch (closes #13054).

Discussion
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[DomCrawler] Document UriResolver

fixes #13040

Commits
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4ce42c9 [DomCrawler] Document UriResolver

Author: OskarStark

components/dom_crawler.rst

@@ -620,6 +620,21 @@ the whole form or specific field(s)::
     $form->disableValidation();
     $form['country']->select('Invalid value');
 
+Resolving URI
+~~~~~~~~~~~~~
+
+.. versionadded:: 5.1
+
+    The `UriResolver` helper was added in Symfony 5.1.
+
+The :class:`Symfony\\Component\\DomCrawler\\UriResolver` class takes an URI
+(relative, absolute, fragment, etc.) and turns it into an absolute URI against
+another given base URI.::
+
+    UriResolver::resolve('/foo', 'http://localhost/bar/foo/'); // => 'http://localhost/foo'
+    UriResolver::resolve('?a=b', 'http://localhost/bar#foo'); // => 'http://localhost/bar?a=b'
+    UriResolver::resolve('../../', 'http://localhost/'); // =>  http://localhost/'
+
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