minor #7324 Do not document deprecated legacy test mechanisms (xabbuh, javiereguiluz)

This PR was merged into the master branch.

Discussion
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Do not document deprecated legacy test mechanisms

see symfony/symfony#21140

Commits
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c2c680a Fixed a minor typo
6f546aa do not document deprecated legacy test mechanisms

Author: javiereguiluz

components/phpunit_bridge.rst

@@ -92,15 +92,8 @@ in the **Unsilenced** section of the deprecation report.
 Mark Tests as Legacy
 --------------------
 
-There are four ways to mark a test as legacy:
-
-* (**Recommended**) Add the ``@group legacy`` annotation to its class or method;
-
-* Make its class name start with the ``Legacy`` prefix;
-
-* Make its method name start with ``testLegacy*()`` instead of ``test*()``;
-
-* Make its data provider start with ``provideLegacy*()`` or ``getLegacy*()``.
+Add the ``@group legacy`` annotation to a test class or method to mark it
+as legacy.
 
 Configuration
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