Fix post-fs-data blocking time in doc #4524

Job	Run time
Build Magisk artifacts	11m 34s
Test building on windows-latest	7m 16s
Test building on ubuntu-latest	3m 46s
Test aosp_cf_x86_64_phone	5m 13s
Test aosp_cf_x86_64_phone_pgagnostic	6m 24s
Test API 23 (x86)	2m 30s
Test API 23 (x86_64)	3m 25s
Test API 24 (x86)	1m 47s
Test API 24 (x86_64)	2m 37s
Test API 25 (x86_64)	2m 42s
Test API 25 (x86)	1m 57s
Test API 26 (x86_64)	2m 57s
Test API 26 (x86)	3m 5s
Test API 27 (x86_64)	3m 56s
Test API 27 (x86)	3m 28s
Test API 28 (x86_64)	3m 34s
Test API 28 (x86)	3m 27s
Test API 29 (x86_64)	3m 5s
Test API 29 (x86)	2m 44s
Test API 30 (x86_64)	3m 35s
Test API 30 (x86)	5m 20s
Test API 31 (x86_64)	3m 43s
Test API 32 (x86_64)	4m 6s
Test API 33 (x86_64)	3m 55s
Test API 34 (x86_64)	3m 38s
Test API 35 (x86_64)	4m 1s
	1h 43m 45s

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