docs: update setup-local-disks link in nodeclasses.md

[toredash]

Update link to setup-local-disks

Description
The script was re-located in this awslabs/amazon-eks-ami@3a5e466 commit

How was this change tested?
N/A

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[jonathan-innis]

LGTM 🚀

[coveralls]

Pull Request Test Coverage Report for Build 11803294863

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.679%

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Totals
Change from base Build 11789121542:	0.0%
Covered Lines:	5661
Relevant Lines:	6847

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💛 - Coveralls