docs(assert): add note and example for Blob comparison #15959

Job	Run time
test-node (latest, ubuntu-latest)	16s
test (v1.x, ubuntu-latest)	1m 43s
test (v1.x, windows-latest)	1m 45s
test (v1.x, macOS-latest)	1m 24s
lint (ubuntu-latest)	26s
wasm (crypto/_wasm)	3s
lint (windows-latest)	40s
test (v2.x, ubuntu-latest)	2m 12s
test (v2.x, windows-latest)	3m 33s
test (v2.x, macOS-latest)	2m 16s
test (canary, ubuntu-latest)	2m 24s
test (canary, windows-latest)	2m 51s
test (canary, macOS-latest)	2m 0s
	21m 33s

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