docs(expect): fix typo on objectContaining example #16295

Job	Run time
test-node (latest, ubuntu-latest)	11s
test (v1.x, ubuntu-latest)	2m 12s
wasm (crypto/_wasm)	3s
test (v1.x, windows-latest)	2m 36s
lint (ubuntu-latest)	9s
test (v1.x, macOS-latest)	2m 0s
test (v2.x, ubuntu-latest)	4m 2s
lint (windows-latest)	20s
test (v2.x, windows-latest)	5m 10s
test (v2.x, macOS-latest)	3m 59s
test (canary, ubuntu-latest)	4m 18s
test (canary, windows-latest)	5m 38s
test (canary, macOS-latest)	4m 44s
	35m 22s

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