doc: pytest: Document the test_net_boot test

Add the test_net_boot.py test to the generated documentation. While most
of this was already commented correctly for inclusion the biggest
problem was examples of code without a code-block notation. This in turn
broke parsing. Add the missing notations. We also must have the comment
prior to any import lines or it will not be seen as a comment on the
overall file and thus not included.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

doc/develop/pytest/index.rst

@@ -18,3 +18,4 @@ Individual tests
    :maxdepth: 1
 
    test_000_version
+   test_net_boot

doc/develop/pytest/test_net_boot.rst

@@ -0,0 +1,8 @@
+test_net_boot
+=============
+
+.. automodule:: test_net_boot
+   :synopsis:
+   :member-order: bysource
+   :members:
+   :undoc-members: