Confusion about where to put add-on usage docs

The "expansion" section is meant to be about how to *build* expansion
hardware. This is where we provide information about what we expect
people to do when building add-on hardware, not about telling people how
to use it. They can infer how to use it, but that should really be
broken down into the "quick start", "design" and "demos" sections.

boards/beagley/ai/04-expansion.rst

@@ -5,12 +5,16 @@ Expansion
 
 .. todo::
 
-   Describe how to build expansion hardware for BeagleY-AI
+   Describe how to build expansion hardware for BeagleY-AI. This section is not about using existing add-on hardware.
 
 PCIe
 ****
 
-For software reference, you can see how PCIe is used on NVMe HATs.
+For software reference, you can :ref:`see how PCIe is used on NVMe HATs<beagley-ai-expansion-nvme>`.
 
-* :ref:`beagley-ai-expansion-nvme`
-* :ref:`beagley-ai-imx219-csi-cameras`
+
+
+CSI
+***
+
+For software reference, you can :ref:`see how CSI is used on IMX219-based camera modules<beagley-ai-imx219-csi-cameras>`.

boards/beagley/ai/05-demos.rst

@@ -9,4 +9,5 @@ Demos and tutorials
    demos/beagley-ai-expansion-nvme
    demos/beagley-ai-pca9685-motor-drivers
    demos/beagley-ai-arducam-imx219-v3link-dual-camera-kit
+   demos/connecting-imx219-csi-cameras