docs: kubeproxy nftables version mismatch

[lethedata]

Add note on nftables version mismatch between kubeproxy container and host OS.

Signed-off-by: Echo Nar echo@lethedata.com

Description

This adds clarity around kubeproxy's nftables requirement between the kubrproxy container and host OS as a mismatch can lead to segmentation faults breaking the host firewall.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Manual test
• Auto test added

Checklist

• My code follows the style guidelines of this project
• My commit messages are signed-off
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[lethedata]

Not sure about the other automatically tested OSes but the EL ones have mismatch issues.

https://docs.k0sproject.io/v1.35.1+k0s.1/system-requirements#host-operating-system

[lethedata]

Removed space to realign table from the 1.