[release-1.1] Add missing ["] in pkg/provider/doc.go file.

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1158

/assign MartinForReal

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot
To complete the pull request process, please assign nilo19 after the PR has been reviewed.
You can assign the PR to them by writing /assign @nilo19 in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[coveralls]

Coverage remained the same at 80.832% when pulling 1360535 on k8s-infra-cherrypick-robot:cherry-pick-1158-to-release-1.1 into e74d5ee on kubernetes-sigs:release-1.1.

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cloud-provider-azure-e2e-ccm-vmss-1-22	1360535	link	true	/test pull-cloud-provider-azure-e2e-ccm-vmss-1-22
pull-cloud-provider-azure-e2e-ccm-vmss-basic-lb-1-22	1360535	link	true	/test pull-cloud-provider-azure-e2e-ccm-vmss-basic-lb-1-22

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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. I understand the commands that are listed here.