doc: Current section is not shown in the side pane nor the page top cookie

[yashi]

Describe the bug
Pages about Device tree bindings doesn't show

• side pane index
• page cookie at the top

To Reproduce
Open one of many binding pages at https://docs.zephyrproject.org/latest/reference/devicetree/bindings.html

e.g) https://docs.zephyrproject.org/latest/reference/devicetree/bindings/cpu/arm%2Ccortex-m3.html#dtbinding-arm-cortex-m3

Expected behavior

1. side pane shows the current section.
2. top cookies show the current location.

Impact
If you land on one of these pages, you don't know where you are.
It doesn't hurt anyone but nice to have them shown.

[gmarull]

These are pages marked as :orphan:, so it is expected. Note that including all bindings/kconfig options in the toctree is not an option since it significantly increases documentation build time.

[yashi]

Thanks. I didn't know it was intentional. Closing.