minor #25565 [2.7][DX] Use constant message contextualisation for deprecations (romainneutron)

This PR was merged into the 2.7 branch.

Discussion
----------

[2.7][DX] Use constant message contextualisation for deprecations

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes

Since many projects are using this mechanism for deprecating feature, it is sometimes difficult to understand which vendor triggers a deprecation.
Sometimes we're using `since Symfony x.y` format, sometimes we are using `since x.y`. I propose to always use `since Symfony x.y` format.

Commits
-------

c2338cbd7a [2.7][DX] Use constant message contextualisation for deprecations

Author: fabpot

Encoder/JsonDecode.php

@@ -49,7 +49,7 @@ public function __construct($associative = false, $depth = 512)
      */
     public function getLastError()
     {
-        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0. Catch the exception raised by the decode() method instead to get the last JSON decoding error.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since Symfony 2.5 and will be removed in 3.0. Catch the exception raised by the decode() method instead to get the last JSON decoding error.', E_USER_DEPRECATED);
 
         return $this->lastError;
     }

Encoder/JsonEncode.php

@@ -39,7 +39,7 @@ public function __construct($bitmask = 0)
      */
     public function getLastError()
     {
-        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0. Catch the exception raised by the encode() method instead to get the last JSON encoding error.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since Symfony 2.5 and will be removed in 3.0. Catch the exception raised by the encode() method instead to get the last JSON encoding error.', E_USER_DEPRECATED);
 
         return $this->lastError;
     }

Encoder/JsonEncoder.php

@@ -38,7 +38,7 @@ public function __construct(JsonEncode $encodingImpl = null, JsonDecode $decodin
      */
     public function getLastEncodingError()
     {
-        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0. Catch the exception raised by the Symfony\Component\Serializer\Encoder\JsonEncode::encode() method instead to get the last JSON encoding error.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since Symfony 2.5 and will be removed in 3.0. Catch the exception raised by the Symfony\Component\Serializer\Encoder\JsonEncode::encode() method instead to get the last JSON encoding error.', E_USER_DEPRECATED);
 
         return $this->encodingImpl->getLastError();
     }
@@ -52,7 +52,7 @@ public function getLastEncodingError()
      */
     public function getLastDecodingError()
     {
-        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0. Catch the exception raised by the Symfony\Component\Serializer\Encoder\JsonDecode::decode() method instead to get the last JSON decoding error.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since Symfony 2.5 and will be removed in 3.0. Catch the exception raised by the Symfony\Component\Serializer\Encoder\JsonDecode::decode() method instead to get the last JSON decoding error.', E_USER_DEPRECATED);
 
         return $this->decodingImpl->getLastError();
     }