minor #7108 Fix typo in code-tag (figaw)

This PR was submitted for the 3.1 branch but it was merged into the 2.7 branch instead (closes #7108).

Discussion
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Fix typo in code-tag

Commits
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127badf Fix typo

Author: xabbuh

quick_tour/the_big_picture.rst

@@ -114,7 +114,7 @@ start with ``/**``, whereas regular PHP comments start with ``/*``.
 
 The first value of ``@Route()`` defines the URL that will trigger the execution
 of the action. As you don't have to add the host of your application to
-the URL (e.g. ```http://example.com``), these URLs are always relative and
+the URL (e.g. ``http://example.com``), these URLs are always relative and
 they are usually called *paths*. In this case, the ``/`` path refers to the
 application homepage. The second value of ``@Route()`` (e.g. ``name="homepage"``)
 is optional and sets the name of this route. For now this name is not needed,