Reworded the explanation about optional command options

Author: javiereguiluz

components/console/introduction.rst

@@ -296,9 +296,12 @@ declare a one-letter shortcut that you can call with a single dash like
 
 .. tip::
 
-    It is also possible to make an option *optionally* accept a value (so that
-    ``--yell``, ``--yell=loud`` or ``--yell loud`` work). Options can also be configured to
-    accept an array of values.
+    It may look that it's possible to make an option *optionally* accept a value
+    (so that ``--yell`` or ``--yell=loud`` work). However, if you call a command
+    with an option without a value, you'll retrieve ``null`` as the option's value
+    which is the same when you omit the option. In practice, this means that a
+    command cannot distinguish between passing an option without a value and not
+    passing that very same option.
 
 For example, add a new option to the command that can be used to specify
 how many times in a row the message should be printed::