pallet-revive: Fix docs.rs

[athei]

• Fixed failing docs.rs build for pallet-revive-uapi by fixing a wring attribute in the manifest (we were using default-target instead of targets)
• Removed the macros defining host functions because the cfg attributes introduced in Add unstable-api feature flag to pallet-revive #6866 won't work on them
• Added an docs.rs specific attribute so that the unstable-hostfn feature tag will show up on the functions that are guarded behind it.

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/12329239896
Failed job name: fmt

[athei]

bot fmt

[command-bot]

@athei https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7924317 was started for your command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh". Check out https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

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[command-bot]

@athei Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7924317 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7924317/artifacts/download.

[jarkkojs]

I don't see prdoc entry, should this have one? Description could explain migration to unstable_hostfn, which would then also help to review the PR overall.

I mean structure of this is like:

1. There's actually only one quite scoped change.
2. Rest "ripples" from that.

So explaining 1 would help others to understand this.

[athei]

/cmd prdoc --audience runtime_dev

[athei]

Ooops. Yeah we need a prdoc in order to bump the pallets on release. Generated from PR description.

[jarkkojs]

Ooops. Yeah we need a prdoc in order to bump the pallets on release. Generated from PR description.

Hmm... there's a way to generate it? :-) I've created the file manually.

[jarkkojs]

wring i.e. wiring?

[jarkkojs]

this is my only complaint, otherwise makes sense