minor symfony#4691 replace "or" with "," (timglabisch)

This PR was merged into the 2.3 branch.

Discussion
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replace "or" with ","

See symfony#4405 (comment)
Just spelling.

Commits
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a950888 replace "or" with ","

Author: wouterj

components/console/introduction.rst

@@ -297,7 +297,7 @@ 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`` or ``--yell=loud`` or ``--yell loud`` work). Options can also be configured to
+    ``--yell``, ``--yell=loud`` or ``--yell loud`` work). Options can also be configured to
     accept an array of values.
 
 For example, add a new option to the command that can be used to specify