minor symfony#20561 Fix annotation type for $context (KmeCnin)

This PR was merged into the 2.8 branch.

Discussion
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Fix annotation type for $context

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Previous type ExecutionContextInterface was referring to a non declared namespace. Replacing it by ExecutionContextInterface2Dot5 fixes autocomplete.

Commits
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55e134c Fix annotation type for $context

Author: fabpot

src/Symfony/Component/Validator/ConstraintValidator.php

@@ -38,7 +38,7 @@ abstract class ConstraintValidator implements ConstraintValidatorInterface
     const OBJECT_TO_STRING = 2;
 
     /**
-     * @var ExecutionContextInterface
+     * @var ExecutionContextInterface2Dot5
      */
     protected $context;