manual: remove suggestion of rust-project.json example

The manual has been linking to the repo

https://github.com/rust-analyzer/rust-project.json-example/tree/master

This repo does not contain a rust-project.json, does not appear to have _ever_ contained a rust-project.json, and my bug report about this has gone untouched: https://github.com/rust-analyzer/rust-project.json-example/issues/4

Since I can't figure out an example, this commit removes the link pending better documentation.
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Cliff L. Biffle 2024-04-26 08:23:50 -07:00 committed by GitHub
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@ -787,8 +787,6 @@ There are three ways to feed `rust-project.json` to rust-analyzer:
Relative paths are interpreted relative to `rust-project.json` file location or (for inline JSON) relative to `rootUri`.
See https://github.com/rust-analyzer/rust-project.json-example for a small example.
You can set the `RA_LOG` environment variable to `rust_analyzer=info` to inspect how rust-analyzer handles config and project loading.
Note that calls to `cargo check` are disabled when using `rust-project.json` by default, so compilation errors and warnings will no longer be sent to your LSP client.