bug #5009 Reworded the explanation about optional command options (javiereguiluz)

This PR was merged into the 2.3 branch.

Discussion
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Reworded the explanation about optional command options

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | #4110

Commits
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89029cd Reworded again the note about "optional options"
221597a Reworded the explanation about "optional options"
1b5fcf0 Reworded the explanation about optional command options

Author: weaverryan

components/console/introduction.rst

@@ -296,9 +296,11 @@ 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.
+    There is nothing forbidding you to create a command with an option that
+    optionally accepts a value. However, there is no way you can distinguish
+    when the option was used without a value (``command --yell``) or when it
+    wasn't used at all (``command``). In both cases, the value retrieved for
+    the option will be ``null``.
 
 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::