Improve build.rs configuration documentations

[patmuk]

Describe the bug

When trying to implement a build.rs, so changes in the rust code trigger code generation, I stumbled over the following issues:

1. The example build.rs in the documentation does not exist.

Another build.rs can be found here, its cargo.toml points to the local frb repository (as CI should take the latest unpublished code).
However, it is not documented what needs to be imported when using the published code.

Steps to reproduce

Works, if the missing peaces are figured ;)

Logs

not applicable

Expected behavior

No response

Generated binding code

No response

OS

No response

Version of flutter_rust_bridge_codegen

No response

Flutter info

No response

Version of clang++

No response

Additional context

I will create a small PR describing the setup better and fixing the link :)

[fzyzcjy]

Totally agree! Seems that #1696 does not fully update everything. Thus maybe:

• Update https://cjycode.com/flutter_rust_bridge/guides/miscellaneous/build-rs to point to the correct path
• Comment that users can depend on the published version - maybe just add a line of comment above

  flutter_rust_bridge/frb_example/dart_build_rs/rust/Cargo.toml

  Line 15 in ed07500

  flutter_rust_bridge_codegen = { path = "../../../frb_codegen" }

  , saying "// Please use flutter_rust_bridge_codegen = "2.x.x" for your app"

[patmuk]

Ups, did not see that PR!
I will do these in a new PR (now).

[fzyzcjy]

Take your time! (I have edited my comment above)

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