docs: fix broken migration doc anchors for tsdown and lint-staged #5691

Job	Run time
detect-changes	4s
Lint	1m 8s
download-previous-rolldown-binaries	10s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 9s
Test (windows-latest, x86_64-pc-windows-msvc)	5m 10s
Test (macos-latest, aarch64-apple-darwin)	1m 52s
Run task	1m 22s
CLI E2E test (macos-latest)	2m 55s
CLI E2E test (ubuntu-latest)	4m 23s
CLI E2E test (windows-latest)	4m 58s
Local CLI `vp install` E2E test	-1s
done	2s
	24m 12s

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