merged branch tacker/2.0 (PR #2641)

Commits
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8399574 Fixes a small php doc issue of Symfony\Component\Console\Command\Command::setDefinition()

Discussion
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Fixes a small php doc issue of Symfony\Component\Console\Command\Command::setDefinition()

Have setDefinition() accept InputDefinition instead of Definition.

src/Symfony/Component/Console/Command/Command.php

@@ -257,7 +257,7 @@ class Command
     /**
      * Sets an array of argument and option instances.
      *
-     * @param array|Definition $definition An array of argument and option instances or a definition instance
+     * @param array|InputDefinition $definition An array of argument and option instances or a definition instance
      *
      * @return Command The current instance
      *