[symfony#2408] Minor tweaks for OutputInterface verbosity level discussion

Author: weaverryan

components/console/introduction.rst

@@ -160,7 +160,7 @@ You can also set these colors and options inside the tagname::
     // bold text on a yellow background
     $output->writeln('<bg=yellow;options=bold>foo</bg=yellow;options=bold>');
 
-Verbosity levels
+Verbosity Levels
 ~~~~~~~~~~~~~~~~
 
 The console has 3 levels of verbosity. These are defined in the
@@ -178,14 +178,21 @@ You can specify the quiet verbosity level with the ``--quiet`` or ``-q``
 option. The ``--verbose`` or ``-v`` option is used when you want an increased
 level of verbosity.
 
-It is possible to print messages in a command only for the according verbosity
+.. tip::
+
+    The full exception stacktrace is printed if the ``VERBOSITY_VERBOSE``
+    level is used.
+
+It is possible to print a message in a command for only a specific verbosity
 level. For example::
 
     if (OutputInterface::VERBOSITY_VERBOSE === $output->getVerbosity()) {
         $output->writeln(...);
     }
 
-Note that when the quiet level is used, all output is suppressed.
+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.
 
 Using Command Arguments
 -----------------------