delete some dirty code from several files in ja

[s-kawamura-w664]

I found the illigal code in ja/docs. The character code is 0x08.
When I saw them in Chrome browser, the character was displayed as rectangle.
I checked all files in ja/docs and deleted them.

Update files:
ja/docs/concepts/cluster-administration/manage-deployment.md
ja/docs/concepts/overview/what-is-kubernetes.md
ja/docs/concepts/policy/resource-quotas.md
ja/docs/concepts/security/overview.md
ja/docs/tasks/access-application-cluster/configure-access-multiple-clusters.md

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[inductor]

Thank you. I will apply it to our workbranch dev-1.19-ja.1 after merging.

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inductor

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[oomichi]

I cannot find strange char on firefox, but can see it on chrome as this PR message said.

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b5606b035af6a46c9818e7f930a0296d4a178a39