docs: fix incorrect Ansible paths and standardize inventory references

[jsuchome]

Update documentation across several files to correct broken file paths and ensure consistency in Ansible command examples

• Standardized inventory naming to inventory.ini for sample inventories.
• Fixed group_vars paths to reflect the actual directory structure (e.g., group_vars/all/all.yml instead of group_vars/all.yml).
• Corrected the k8s-cluster.yml filename in guides.
• Clarified the location for kubectl_localhost and kubeconfig_localhost settings.
• Replaced non-existent placeholders (like inventory/single.cfg) with valid repository paths.
• Fixed typos in directory names (e.g., myclsuter -> mycluster).

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Fixes the ansible related documentation

Which issue(s) this PR fixes:

Fixes #13245

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jsuchome / name: Jiri Suchomel (5cca0ab)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jsuchome
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[k8s-ci-robot]

Hi @jsuchome. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[yankay]

/ok-to-test

[guoard]

/lgtm