sync: Clarify aspect mask specification #91

Job	Run time
android_cmake (arm64-v8a, ON, c++_shared)	20m 49s
android_cmake (armeabi-v7a, OFF, c++_static)	13m 30s
gn	10m 16s
integration_test	3m 58s
macos (min)	2m 36s
macos (latest)	25m 57s
linux (ubuntu-22.04, gcc, g++, -fsanitize=address, -fsanitize=address, debug, 17, ON)	39m 57s
linux (ubuntu-22.04, gcc, g++, -fsanitize=address, -fsanitize=address, release, 17, ON)	46m 18s
linux (ubuntu-22.04, gcc, g++, -fsanitize=thread, -fsanitize=thread, debug, 17, ON)	1h 21m 53s
linux (ubuntu-22.04, gcc, g++, -fsanitize=thread, -fsanitize=thread, release, 17, ON)	1h 13m 50s
linux (ubuntu-20.04, gcc, g++, release, 17, ON)	34m 25s
linux (ubuntu-22.04, gcc, g++, release, 20, ON)	7m 50s
linux (ubuntu-22.04, clang, clang++, release, 17, ON)	32m 53s
linux (ubuntu-22.04, clang, clang++, release, 17, OFF, -fsanitize=address, -fsanitize=address)	34m 36s
mingw	42m 44s
windows (amd64, debug, windows-latest)	19m 31s
windows (amd64, release, windows-latest)	31m 1s
windows (amd64_x86, debug, windows-latest)	18m 1s
windows (amd64_x86, release, windows-latest)	37m 52s
	9h 37m 57s

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