docs: fix typos in bullmq.md #7151

Job	Run time
lint (18.x)	6m 41s
test-core (18.x)	2m 25s
test-formio (18.x)	2m 20s
test-graphql (18.x)	2m 22s
test-integration (ubuntu-latest, 16.x)	2m 59s
test-orm (18.x)	2m 20s
test-integration (ubuntu-latest, 18.x)	2m 59s
test-platform (18.x)	2m 23s
test-integration (macos-latest, 18.x)	5m 51s
test-security (18.x)	2m 21s
test-integration (windows-latest, 18.x)	7m 6s
test-specs (18.x)	2m 23s
test-third-parties (18.x)	2m 24s
deploy-packages	0s
publish-docs	0s
	44m 34s

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