zh: update info on EKS and dashboard access (#1232)

[ti-chi-bot]

This is an automated cherry-pick of #1232

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added, or deleted? (Required)

• Add more details about accessing TiDB with an nlb with internal scheme
• Link to info about using TiDB Dashboard
• Update info about TiDB Dashboard with Kubernetes

Which TiDB Operator version(s) do your changes apply to? (Required)

• master (the latest development version)
• v1.1 (TiDB Operator 1.1 versions)
• v1.0 (TiDB Operator 1.0 versions)

What is the related PR or file link(s)?

• This PR is translated from: en: Update info on EKS and dashboard access #1212
• Other reference link(s):
  examples: Update AWS ELB config tidb-operator#3974
  TiDB Operator - Cannot connect to TiDB Service for TiDB Cluster External IP tidb-operator#3941

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Joyinqin]

@qiancai PTAL again, thx~

[qiancai]

/lgtm

[ti-chi-bot]

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[qiancai]

/merge

[ti-chi-bot]

@qiancai: /merge in this pull request requires 1 approval(s).

In response to this:

/merge

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[qiancai]

/lgtm

[ti-chi-bot]

@qiancai: Please use GitHub review feature instead of /lgtm [cancel] when you want to submit review to the pull request.
For how to use GitHub review feature, see also this document provided by GitHub.

For the reason we drop support to the commands, see also this page.
This reply is being used as a temporary reply during the migration of review process and will be removed on July 1st.

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qiancai

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[qiancai]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 68385bd