polkadot-sdk-docs: Use command_macro!

[ndkazu]

Description

Understood assignment:
Initial assignment description is in #6194 : find every occurrence of #[docify::export] where process:Command is used → replace the use of process:Command by command_macro!

Issues observed:

• The tests using #[docify::export] & process:Command are failing to begin with (tested & worked on: ~/polkadot-sdk/docs/sdk/src/reference_docs/chain_spec_runtime/tests/chain_spec_builder_tests.rs)
• Probably due to a lack of maintenenance of the crate command_macro the following file needed some modifications: ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/command-macros-plugin-0.2.7/src/lib.rs

I am running cargo +nightly test from ~/polkadot-sdk/docs/sdk/src/reference_docs/chain_spec_runtime/

Same test failures are observed after changing from process:Command to command_macro!

Some assistance is needed.

[iulianbarbu]

Can you please use cmd_lib instead of command_macro? We already use it with chain-spec-builder and works fine.

[ndkazu]

Can you please use cmd_lib instead of command_macro? We already use it with chain-spec-builder and works fine.

@iulianbarbu, I used a slightly modified version of the macro used in chain-spec-builder, and now cmd_lib seems to work fine. However, I am still facing a BIG problem: The tests were failing in the first place: output.stdout was an empty [u8] (You can see it in the test generate_chain_spec). For now I can confirm that the tests are failing the same way after modification, but this isn't enough.

[ndkazu]

Bot fmt and label needed 👀

[iulianbarbu]

This is almost there I think, thanks!

[iulianbarbu]

Thanks @ndkazu , one small remark related to the PRDOC.

[ndkazu]

@iulianbarbu it's done: Thank you for the mentoring during this PR⇒ I learned a lot!!!!