doc: add nconnect mount option in the doc

[andyzhangx]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
doc: add nconnect mount option in the doc

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[andyzhangx]

/retest

[andyzhangx]

/retest

[andyzhangx]

/cherrypick release-1.29

[andyzhangx]

/cherrypick release-1.28

[k8s-infra-cherrypick-robot]

@andyzhangx: cannot checkout release-1.29: error checking out "release-1.29": exit status 1 error: pathspec 'release-1.29' did not match any file(s) known to git

In response to this:

/cherrypick release-1.29

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-infra-cherrypick-robot]

@andyzhangx: cannot checkout release-1.28: error checking out "release-1.28": exit status 1 error: pathspec 'release-1.28' did not match any file(s) known to git

In response to this:

/cherrypick release-1.28

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.

[andyzhangx]

/cherrypick release-1.23

[andyzhangx]

/cherrypick release-1.22

[andyzhangx]

/cherrypick release-1.21

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #1133

In response to this:

/cherrypick release-1.23

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-infra-cherrypick-robot]

@andyzhangx: new pull request created: #1134

In response to this:

/cherrypick release-1.22

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-infra-cherrypick-robot]

@andyzhangx: new pull request created: #1135

In response to this:

/cherrypick release-1.21

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.