Update trait tags for resources-as-components (#24222)

# Objective

Follow up on resources-as-components.
Update trait tags in rustdoc-generated documentation:
- do not add component tag on resources, as that's offers no new
information
- mark immutable resources as immutable, like with component trait

## Testing

RUSTDOCFLAGS="--html-after-content docs-rs/trait-tags.html --cfg
docsrs_dep" RUSTFLAGS="--cfg docsrs_dep" cargo doc --no-deps --package
bevy_ecs

## Showcase

Before:
<img width="323" height="72" alt="Screenshot_20260509_233133"
src="https://github.com/user-attachments/assets/b0448b13-3ce0-4c6e-8c3b-9e91a0ba521f"
/>
After: 
<img width="331" height="70" alt="Screenshot_20260509_233051"
src="https://github.com/user-attachments/assets/650d0adf-e075-4e67-98f0-41ac7bf30dfe"
/>