minor #9664 [Console] box-double table style (snoek09)

This PR was merged into the master branch.

Discussion
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[Console] box-double table style

This partly fixes #9646.

Commits
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e0be8ce box-double table style

Author: javiereguiluz

components/console/helpers/table.rst

@@ -164,6 +164,27 @@ which outputs:
 .. versionadded:: 4.1
     The ``box`` style was introduced in Symfony 4.1.
 
+You can also set the style to ``box-double``::
+
+    $table->setStyle('box-double');
+    $table->render();
+
+which outputs:
+
+.. code-block:: text
+
+    ╔═══════════════╤══════════════════════════╤══════════════════╗
+    ║ ISBN          │ Title                    │ Author           ║
+    ╠═══════════════╪══════════════════════════╪══════════════════╣
+    ║ 99921-58-10-7 │ Divine Comedy            │ Dante Alighieri  ║
+    ║ 9971-5-0210-0 │ A Tale of Two Cities     │ Charles Dickens  ║
+    ║ 960-425-059-0 │ The Lord of the Rings    │ J. R. R. Tolkien ║
+    ║ 80-902734-1-6 │ And Then There Were None │ Agatha Christie  ║
+    ╚═══════════════╧══════════════════════════╧══════════════════╝
+
+.. versionadded:: 4.1
+    The ``box-double`` style was introduced in Symfony 4.1.
+
 If the built-in styles do not fit your need, define your own::
 
     use Symfony\Component\Console\Helper\TableStyle;