Clean up /kubeadm/install-kubeadm.md

[windsonsea]

Performed actions below:

• Remove redundant blank lines and add a blank line after a heading
• Tweak long lines
• Provide a consistent indentations for list in tabs

[tengqm]

/kind cleanup
/lgtm
/approve
Thanks.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5363f682f0d4d71fe09076fc83bcd8fa7b170f51

[k8s-ci-robot]

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[afbjorklund]

@windsonsea :

This commit broke the rendering, by indenting the "caution" macro (thereby destroying the install tabs)

So now the tarball instructions are repeated, also for the package installations. These tabs are confusing...

[windsonsea]

Sorry, will fix it soon.

[afbjorklund]

If you are cleaning up the page, there is an issue with the "these instructions are for k8s 1.28" indented under SELinux

Red Hat-based distributions

1. Set SELinux to permissive mode:

These instructions are for Kubernetes 1.28.

These lines should probably be swapped around ?

[windsonsea]

Hi @afbjorklund , should we open an issue if the procedure requires update? I am unsure and have not verified whether the steps and commands are correct or not.

[afbjorklund]

Sure, it is a separate issue

[tengqm]

I'm unaware of these limitations of the tabs struct, though I really dislike it.
When I try print the docs, tabs doesn't expand. Tabs are only making the pages fancy,
and they sometimes help shorten the page for visual scanning.
Sorry for having merged this in a premature state.

[afbjorklund]

Linking to the content (in a tab) is also harder