minor #16414 removed all @Covers annotations (fabpot)

This PR was merged into the 2.3 branch.

Discussion
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removed all @Covers annotations

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Some unit tests have a `@covers` PHPUnit annotations. Most of them were added a very long time ago, but since then, we did not use them anymore and the existing ones are not maintained (see #16413). So, I propose to remove them all.

Commits
-------

1e0af36 removed all @Covers annotations

Author: fabpot

Tests/OptionsTest.php

@@ -392,7 +392,6 @@ public function testClearRemovesAllOptions()
     }
 
     /**
-     * @covers Symfony\Component\OptionsResolver\Options::replace
      * @expectedException \Symfony\Component\OptionsResolver\Exception\OptionDefinitionException
      */
     public function testCannotReplaceAfterOptionWasRead()
@@ -406,7 +405,6 @@ public function testCannotReplaceAfterOptionWasRead()
     }
 
     /**
-     * @covers Symfony\Component\OptionsResolver\Options::overload
      * @expectedException \Symfony\Component\OptionsResolver\Exception\OptionDefinitionException
      */
     public function testCannotOverloadAfterOptionWasRead()
@@ -418,7 +416,6 @@ public function testCannotOverloadAfterOptionWasRead()
     }
 
     /**
-     * @covers Symfony\Component\OptionsResolver\Options::clear
      * @expectedException \Symfony\Component\OptionsResolver\Exception\OptionDefinitionException
      */
     public function testCannotClearAfterOptionWasRead()