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Add info to manual similarity threshold #195

Job	Run time
build_and_test (x86, non-SIMD)	7m 8s
build_and_test (x86, SSE2)	1m 52s
build_and_test (x86, auto-selected)	1m 48s
build_and_test (x86_64, non-SIMD)	6m 57s
build_and_test (x86_64, SSE2)	1m 19s
build_and_test (x86_64, auto-selected)	1m 16s
build_and_test (armv7, non-SIMD)	54m 58s
build_and_test (armv7, SSE2)	24s
build_and_test (armv7, auto-selected)	17m 11s
build_and_test (aarch64, non-SIMD)	58m 19s
build_and_test (aarch64, SSE2)	10s
build_and_test (aarch64, auto-selected)	16m 51s
	2h 48m 13s

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