v1.3 en, zh: remove the auto scaling doc

[lilin90]

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

This PR removes the Enable TiDB Cluster Auto-scaling in Kubernetes, 对 Kubernetes 上的 TiDB 集群启用自动弹性伸缩 pages.

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

• master (the latest development version)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)
• 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]

[LGTM Timeline notifier]

Timeline:

• 2024-09-14 08:00:02.90470516 +0000 UTC m=+688872.645129094: ☑️ agreed by Oreoxmt.
• 2024-09-14 08:08:26.193054197 +0000 UTC m=+689375.933478203: ☑️ agreed by csuzhangxc.

[lilin90]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [lilin90]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment