docs: add spell checker info to contrib guide #11698

Job	Run time
Prepare CI Run	4s
Store tag of the built images	3s
Unit Tests (lifecycle-operator, lifecycle-operator/)	1m 10s
Build Docker Image (lifecycle-operator, lifecycle-operator/)	1m 31s
Unit Tests (metrics-operator, metrics-operator/)	1m 18s
Build Docker Image (metrics-operator, metrics-operator/)	2m 15s
Unit Tests (scheduler, scheduler/)	38s
Build Docker Image (scheduler, scheduler/)	1m 42s
Unit Tests (certificate-operator, klt-cert-manager/)	27s
Build Docker Image (deno-runtime, runtimes/deno-runtime/)	32s
Build Docker Image (python-runtime, runtimes/python-runtime/)	35s
Build Docker Image (certificate-operator, klt-cert-manager/)	2m 6s
Component Tests / Component Tests	2m 49s
Publish helm chart changes to charts repo	0s
Load Tests / Run load Tests	6m 56s
End to End Tests / Run E2E Tests (lifecycle-operator, lifecycle-operator/)	2m 35s
Performance Tests / Performance Tests	1m 52s
End to End Tests / Run E2E Tests (scheduler, scheduler/)	3m 27s
Integration Tests (gates_off, allowed_ns_off) / Run Integration Tests	10m 35s
Integration Tests (gates_off, allowed_ns_on) / Run Integration Tests	3m 9s
Integration Tests (gates_on, allowed_ns_off) / Run Integration Tests	11m 7s
Integration Tests (gates_on, allowed_ns_on) / Run Integration Tests	3m 3s
	57m 54s

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