Fix IPC tutorial

[mini-1235]

Description

Fixes #2333

Did you use Generative AI?

Yes, Github Copilot to rephrase sentences

Additional Information

cc @fujitatomoya

[fujitatomoya]

lgtm.

@alsora can you also take a look at this?

[fujitatomoya]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[wjwwood]

Please hold this pr, I need to follow up on what's going on here. I don't understand how/why all the pointers are the same. If someone know why this is now the case, please let me know.

[alsora]

This seems correct to me.
The documentation in the demo README correclty reflects that https://github.com/ros2/demos/tree/rolling/intra_process_demo, but for some reason this tutorial page had different docs that were wrong.

The image viewers use shared ptr subscriptions, so the same pointer published by the watermarker goes to both https://github.com/ros2/demos/blob/rolling/intra_process_demo/include/image_pipeline/image_view_node.hpp#L44

I don't like that we have duplicated docs, but this is unrelated to this PR, which looks good to me.

[sloretz]

@wjwwood I saw you took an updated image of the posters this week. Would you be willing to push a commit with that image to this PR? 🧇

[wjwwood]

Yes, but I do need to make a pull request to the demo repo too. I was cleaning that up first. I'll try to do that tomorrow.