minor #10449 fix #310430: DomCrawler component selectButton() docs update (e-moe, javiereguiluz)

This PR was merged into the 2.8 branch.

Discussion
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fix #310430: DomCrawler component selectButton() docs update

fixes #10430  DomCrawler component and Symfony Testing docs contradict each other

Commits
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a910f52 Reword
3a0050a fix #310430: DomCrawler component selectButton() docs update

Author: javiereguiluz

components/dom_crawler.rst

@@ -324,9 +324,13 @@ Forms
 ~~~~~
 
 Special treatment is also given to forms. A ``selectButton()`` method is
-available on the Crawler which returns another Crawler that matches a button
-(``input[type=submit]``, ``input[type=image]``, or a ``button``) with the
-given text. This method is especially useful because you can use it to return
+available on the Crawler which returns another Crawler that matches ``<button>``
+or ``<input type="submit">`` or ``<input type="button">`` elements (or an
+``<img>`` element inside them). The string given as argument is looked for in
+the ``id``, ``alt``, ``name``, and ``value`` attributes and the text content of
+those elements.
+
+This method is especially useful because you can use it to return
 a :class:`Symfony\\Component\\DomCrawler\\Form` object that represents the
 form that the button lives in::