Update doc.go import for staging/src/k8s.io/api/storage/v1/doc.go

[amandahla]

What this PR does / why we need it:
update doc.go in:
staging/src/k8s.io/api/storage/v1/doc.go

This is necessary so that if someone wants to import only this package, the import path is not referred to as github.com, but as the k8s.io vanity url.
Ref: https://golang.org/doc/go1.4#canonicalimports

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Only a partial fix for #68231

Special notes for your reviewer:

Release note:

NONE

[k8s-ci-robot]

@amandahla: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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.

[k8s-ci-robot]

Hi @amandahla. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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.

[neolit123]

thanks for the PR @amandahla

/lgtm
/ok-to-test
/priority important-longterm
/assign @smarterclayton

[neolit123]

/release-note-none

[nikhita]

/assign @liggitt
for approval

[liggitt]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amandahla, liggitt

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

The pull request process is described here

Needs approval from an approver in each of these files:

• staging/src/k8s.io/api/OWNERS [liggitt]

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