docs: add note about eksctl breaking change

[jmdeal]

Fixes #N/A

Description
Adds a note in the getting started guide about eksctl-io/eksctl#7775.

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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[coveralls]

Pull Request Test Coverage Report for Build 9276903394

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 82.55%

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Files with Coverage Reduction	New Missed Lines	%
pkg/providers/amifamily/ami.go	1	90.56%

Totals
Change from base Build 9231904896:	-0.02%
Covered Lines:	5549
Relevant Lines:	6722

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💛 - Coveralls

[bryantbiggs]

FYI - we got this patched in eksctl eksctl-io/eksctl#7775 (comment)