First time setup issues on Windows following optimization recommendations

[morsley]

Describe the issue

Enhancements for the Windows target in Getting Started > Setup are incorrect and lead to failed compiles.

Proposed Solution

There are three major problems I ran into while troubleshooting this I needed to resolve before getting to a successful build.

1. sccache has a bug with the current latest version 0.17.0

mozilla/sccache#2397

2. nightly share-generics advice is backwards (or at least doesn't have a cutout for Windows developers), but it is correct in the example file link

bevyengine/bevy#2016

https://github.com/bevyengine/bevy/blob/b56fc29d3016e641754765244b5ba3f9cc504671/.cargo/config_fast_builds.toml#L134-L158

3. there's an issue with the nightly trait solver that I was informed on Discord should be temporary, but I still wanted to mention here as well

bevyengine/bevy#25511

Additional Information (optional)

I fixed these by disabling share-generics, setting next-solver to coherence, and installing sccache@0.16.0.