doc: pytest: Document the test_bootmenu test

Add this test to the documentation. There was already a function comment
that included the argument, so convert it to the right style to be
rendered correctly in output.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/pytest/test_bootmenu.rst b/doc/develop/pytest/test_bootmenu.rst
new file mode 100644
index 0000000..e2ff5c4
--- /dev/null
+++ b/doc/develop/pytest/test_bootmenu.rst
@@ -0,0 +1,8 @@
+test_bootmenu
+=============
+
+.. automodule:: test_bootmenu
+   :synopsis:
+   :member-order: bysource
+   :members:
+   :undoc-members: