Merge pull request #3048 from lyrixx/console-ouput-verbosity

Documents Output::*Verbose methods

Author: weaverryan

components/console/introduction.rst

@@ -196,6 +196,31 @@ level. For example::
         $output->writeln(...);
     }
 
+.. versionadded:: 2.4
+   The :method:`Symfony\\Component\Console\\Output\\Output::isQuiet`,
+   :method:`Symfony\\Component\Console\\Output\\Output::isVerbose`,
+   :method:`Symfony\\Component\Console\\Output\\Output::isVeryVerbose` and
+   :method:`Symfony\\Component\Console\\Output\\Output::isDebug`
+   methods were introduced in version 2.4
+
+.. code-block:: php
+
+    if ($output->isQuiet()) {
+        // ...
+    }
+
+    if ($output->isVerbose()) {
+        // ...
+    }
+
+    if ($output->isVeryVerbose()) {
+        // ...
+    }
+
+    if ($output->isDebug()) {
+        // ...
+    }
+
 When the quiet level is used, all output is suppressed as the default
 :method:`Symfony\Component\Console\Output::write <Symfony\\Component\\Console\\Output::write>`
 method returns without actually printing.