test(log): re-enable doc tests for `FileHandler` (#6321) #16218

Job	Run time
test-node (latest, ubuntu-latest)	14s
lint (ubuntu-latest)	25s
wasm (crypto/_wasm)	3s
test (v1.x, ubuntu-latest)	1m 18s
lint (windows-latest)	42s
test (v1.x, windows-latest)	1m 37s
test (v1.x, macOS-latest)	1m 39s
test (v2.x, ubuntu-latest)	2m 38s
test (v2.x, windows-latest)	2m 52s
test (v2.x, macOS-latest)	2m 39s
test (canary, ubuntu-latest)	3m 48s
test (canary, windows-latest)	3m 29s
test (canary, macOS-latest)	3m 3s
	24m 27s

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