Documentation for shader built-in include files (godotengine/godot#94193)

[Jackerty]

Documents merged feature godotengine/godot#94193 to the end of the compute shader tutorial.

If someone has a better example in mind I'm open to suggestions. I just wanted something short that does not have too much extra code around the include.

[skyace65]

Are you running your non-code text for this PR through a translator?

[Jackerty]

I do run them through (freemium) Grammarly...

[Jackerty]

To be clear, can I fix that CI error or should I wait?

[fire]

Please fix CI errors as soon as you can!

[Jackerty]

I don't think that CI error is caused by this PR

[Jackerty]

For future reference

Run /home/runner/work/_actions/lycheeverse/lychee-action/v2/entrypoint.sh
   [WARN ] Error creating request: InvalidBaseJoin("_static/")
   [WARN ] Error creating request: InvalidBaseJoin("res://someresource.res::1")
Error:  https://webd97.de/post/gitlab-pages-compression/ | Network error: error sending request for url (https://webd97.de/post/gitlab-pages-compression/) Maybe a certificate error?
# Summary

| Status        | Count |
|---------------|-------|
| 🔍 Total      | 1633  |
| ✅ Successful | 893   |
| ⏳ Timeouts   | 0     |
| 🔀 Redirected | 0     |
| 👻 Excluded   | 739   |
| ❓ Unknown    | 0     |
| 🚫 Errors     | 1     |

## Errors per input

### Errors in tutorials/export/exporting_for_web.rst

Error: R] [https://webd97.de/post/gitlab-pages-compression/](https://webd97.de/post/gitlab-pages-compression/) | Network error: error sending request for url (https://webd97.de/post/gitlab-pages-compression/) Maybe a certificate error?

Error: Process completed with exit code 2.

[Jackerty]

There is a broken link in exporting_for_web.rst. Making an issue.

[Jackerty]

What I found -> #10717

[Jackerty]

Took a while, but reworked the example to be a pulsating transparent circle. The proposal now explains better what the example code does.