📖 Remove 'is is' typo in book

[killianmuldoon]

Signed-off-by: killianmuldoon [email protected]

Remove instances of 'is is' from across the codebase.

Fixes ##7084 (comment)

[k8s-ci-robot]

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[killianmuldoon]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@killianmuldoon: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.2

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[chrischdi]

/lgtm

[stmcginnis]

/lgtm

[sbueringer]

/approve

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/approve

/cherry-pick release-1.2

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-infra-cherrypick-robot]

@killianmuldoon: new pull request created: #7086

In response to this:

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.