fix hyperlink content in README_zh.md

[orionzone]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Fixed the broken hyperlinks in the "安装可插拔功能组件" and "用户案例学习" in README_zh.md and changed them to correct hyperlinks

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.:

[ks-ci-bot]

Hi @snowgo. Thanks for your PR.

I'm waiting for a kubesphere 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.

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[wansir]

/lgtm
/approve

[ks-ci-bot]

LGTM label has been added.

Git tree hash: 59f2da7f41eb5dbfb1ff5d3d3d9b1bb44ba755e9

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: snowgo, wansir

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