Update README.md

[dalongxia2017]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fix redundant statements in the example documentation.

Fixes #

Special notes for your reviewer:

Just fix some minor errors in the documentation.

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE

[linux-foundation-easycla]

• ✅login: dalongxia2017 / (b1b3e3a)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

Welcome @dalongxia2017!

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[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dalongxia2017, yliaog

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