Fix typos in files which are used for generating OpenAPI

[invidian]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Right now when projects use https://github.com/kubernetes-sigs/custom-metrics-apiserver/blob/master/test-adapter/generated/openapi/zz_generated.openapi.go, they inherit couple of typos, which will be detected by tools like codespell.

This PR fixes those typos.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[neolit123]

/ok-to-test

[invidian]

There are still some files with those typos, but I'm not sure if they should be fixed as well:

$ git grep -E '(fileystem|assigment|coersion)' | cut -d: -f1
staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/testdata/swagger.json
staging/src/k8s.io/cli-runtime/artifacts/openapi/swagger.json
staging/src/k8s.io/cli-runtime/artifacts/openapi/swagger.json
staging/src/k8s.io/kubectl/testdata/openapi/swagger.json
staging/src/k8s.io/kubectl/testdata/openapi/swagger.json
vendor/sigs.k8s.io/kustomize/api/krusty/kustomizer.go
vendor/sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1204/swagger.json
vendor/sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1204/swagger.json

I guess remaining artifacts and testdata in staging/ can be fixed by hand and vendor must be fixed in https://github.com/kubernetes-sigs/kustomize/blob/master/api/krusty/kustomizer.go, right?

EDIT: Opened kubernetes-sigs/kustomize#4169 for kustomize.

[RinkiyaKeDad]

/test check-dependency-stats

[caesarxuchao]

/lgtm
/approve

[caesarxuchao]

/assign @lavalamp
for approval

[fedebongio]

/triage accepted

[lavalamp]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: caesarxuchao, invidian, lavalamp

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• api/OWNERS [lavalamp]
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• staging/src/k8s.io/apiextensions-apiserver/OWNERS [lavalamp]
• staging/src/k8s.io/apimachinery/pkg/apis/OWNERS [lavalamp]
• staging/src/k8s.io/code-generator/OWNERS [lavalamp]
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