Update doc/en/deprecations.rst

Co-authored-by: Peter Bittner <[email protected]>

Author: nicoddemus

doc/en/deprecations.rst

@@ -87,7 +87,7 @@ that manipulate this type of file (for example, Jenkins, Azure Pipelines, etc.).
 Users are recommended to try the new ``xunit2`` format and see if their tooling that consumes the JUnit
 XML file supports it.
 
-To use the new format, update your ``pytest.ini``:
+To use the new format in pytest <6.0, update your ``pytest.ini``:
 
 .. code-block:: ini