en,zh: use variable to indicate clinic version

[yiduoyunQ]

First-time contributors' checklist

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

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

update clinic doc, let customer get newly diag version first and install newly version

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

• [x] master (the latest development version)
• [x] v1.5 (TiDB Operator 1.5 versions)
• [x] v1.4 (TiDB Operator 1.4 versions)
• [x] v1.3 (TiDB Operator 1.3 versions)
• [x] v1.2 (TiDB Operator 1.2 versions)

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

• This PR is translated from:
• Other reference link(s):

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2023-06-20 05:43:46.485752368 +0000 UTC m=+81591.887002802: :ballot_box_with_check: agreed by ran-huang.

[ran-huang]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ran-huang

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/docs-tidb-operator/blob/master/OWNERS)~~ [ran-huang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.5: #2390.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.4: #2391.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.3: #2392.