ssr fix and add some documents

[newDINO]

Objective

Screen space reflection didn't work for my program, so I tried cloning bevy repo and running the ssr example to see whether it works or not, and it didn't. I figured out that the problem is that prepare_ssr_pipelines system only runs for views with ExtractedAtmosphere. So I removed this filter because it already uses Has<ExtractedAtmosphere>. And the example works afterwards.

I later found that the With<ExtractedAtmosphere> filter is not added to bevy 0.17, so the problem in my own program is not the same as the ssr example. I compared the ssr example and my program and found that I didn't add DefaultOpaqueRendererMethod::deferred() resource. So I added a few docs to state that deferred rendering is not automatically enabled when ssr is added.

Solution

1. remove With<ExtractedAtmosphere> filter in prepare_ssr_pipelines.
2. add more documentation.

Testing

I tested the ssr example and atmosphere example and both look fine.

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