docs(toolchains): set dev_dependency=True on repo rule invocation

[honglooker]

Move dev_dependency = True to the repo rule invocation. The use_repo_rule call
doesn't support that arg.

[aignas]

This is not what the bazel docs say here

[honglooker]

Hmm, not what I'm seeing in our CI: https://github.com/protocolbuffers/protobuf/actions/runs/16726777050/job/47344412543#step:6:592

cc @rickeylev

[aignas]

@meteorcloudy, could you please clarify if this is a bug in bazel or bazel docs?

[meteorcloudy]

The repo_rule_proxy belongs to the repo rule proxy not use_repo_rule directive. So the correct usage is

local_runtime_repo(
    name = "local_python3",
    interpreter_path = "python3",
    on_failure = "fail",
    dev_dependency = True,
)

I can see how the doc might be confusing, happy to help review a PR to help clarify this!

/cc @Wyverald

problem addressed

[rickeylev]

Thanks for fixing the docs @honglooker!

[honglooker]

np :)