use wgpu's Backends::PRIMARY instead of Backends::all() #2717

	name: Document
	on: [push, pull_request]
	jobs:
	all:
	runs-on: ubuntu-20.04
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	steps:
	- uses: hecrj/setup-rust-action@v2
	with:
	rust-version: nightly
	- uses: actions/checkout@v2
	- name: Generate documentation
	run: \|
	RUSTDOCFLAGS="--cfg docsrs" \
	cargo doc --no-deps --all-features \
	-p futures-core \
	-p iced_core \
	-p iced_highlighter \
	-p iced_futures \
	-p iced_runtime \
	-p iced_graphics \
	-p iced_wgpu \
	-p iced_tiny_skia \
	-p iced_renderer \
	-p iced_widget \
	-p iced_winit \
	-p iced
	- name: Write CNAME file
	run: echo 'docs.iced.rs' > ./target/doc/CNAME
	- name: Copy redirect file as index.html
	run: cp docs/redirect.html target/doc/index.html
	- name: Publish documentation
	if: github.ref == 'refs/heads/master'
	uses: peaceiris/actions-gh-pages@v3
	with:
	deploy_key: ${{ secrets.DOCS_DEPLOY_KEY }}
	external_repository: iced-rs/docs
	publish_dir: ./target/doc

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