Improve deprecation wording

People that are starting a new project will immediately know what this
is about, but people upgrading doctrine might get a lot of these and
should have a better clue regarding what this is about.

Author: Grégoire Paris

lib/Doctrine/DBAL/Schema/Column.php

@@ -121,7 +121,7 @@ public function setOptions(array $options)
             if ( ! method_exists($this, $method)) {
                 // next major: throw an exception
                 @trigger_error(sprintf(
-                    'The "%s" option is not supported,'.
+                    'The "%s" doctrine column option is not supported,'.
                     ' setting it is deprecated and will cause an error in 3.0',
                     $name
                 ), E_USER_DEPRECATED);

tests/Doctrine/Tests/DBAL/Schema/ColumnTest.php

@@ -58,7 +58,7 @@ public function testToArray()
 
     /**
      * @group legacy
-     * @expectedDeprecation The "unknown_option" option is not supported, setting it is deprecated and will cause an error in 3.0
+     * @expectedDeprecation The "unknown_option" doctrine column option is not supported, setting it is deprecated and will cause an error in 3.0
      */
     public function testSettingUnknownOptionIsStillSupported() : void
     {