Update Turbopack CSS docs #19072

Job	Run time
Determine jobs to run	24s
JS Package Tests (ubuntu, self-hosted, linux, x64, metal)	46s
JS Package Tests (macos, macos-latest)	2m 11s
Turborepo Examples	0s
Build Turborepo	0s
Rust lints	0s
Turbopack rust check	0s
Turborepo rust check	0s
Turbopack TypeScript files	0s
Formatting	1m 1s
Check next-swc	0s
Turborepo Integration	0s
Turborepo Rust testing on ${{ matrix.os.name }}	0s
Turbopack Rust testing benchmarks on ${{ matrix.os.name }}	0s
Turborepo rust clippy	0s
Turbopack Rust testing benchmarks on linux	0s
Turbopack rust clippy	0s
Turbopack Rust testing on ubuntu	0s
Turbopack Rust testing on ${{ matrix.os.name }}	0s
Upload Test results	55s
Ok	4s
Done	3s
Cleanup / cleanup	7s
	5m 31s

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