fix a broken link of eksctl

[Oreoxmt]

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

Close #2509 #2508 #2507 #2506

The documentation page previous found at https://eksctl.io/usage/managing-nodegroups/ has been updated to a new URL https://eksctl.io/usage/nodegroups/. This change was made in https://github.com/eksctl-io/eksctl/commit/aec56df90f29feeead74d1eb5cd643cda907229f

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):

[Oreoxmt]

/cc @csuzhangxc

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-27 08:37:05.201542725 +0000 UTC m=+951113.949165821: :ballot_box_with_check: agreed by csuzhangxc.

[Oreoxmt]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.2: #2511.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.3: #2512.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.4: #2513.