Remove unneeded versionadded directives

Author: javiereguiluz

testing.rst

@@ -812,17 +812,6 @@ However, Symfony provides useful shortcut methods for the most common cases:
     :local:
     :depth: 1
 
-.. versionadded:: 4.3
-
-    The shortcut methods for assertions using ``WebTestCase`` were introduced
-    in Symfony 4.3.
-
-.. versionadded:: 4.4
-
-    Starting from Symfony 4.4, when using `symfony/panther`_ for end-to-end
-    testing, you can use all the following assertions except the ones related to
-    the :doc:`Crawler </components/dom_crawler>`.
-
 Response Assertions
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