Fixed typos in inventory/sample/group_vars/k8s_cluster

[arahmangulov]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
This PR fixes typos in group vars of the sample inventory:

1. The main concern is about uncommenting the metallb_config in the user inventory (created by inventory builder): extra l letter in the tollerations word which affets the metallb_config.controller.tolerations if-statement, since by default the Tolerations of the speaker contains only a default: node-role.kubernetes.io/control-plane:NoSchedule op=Exists, there is no custom defined toleration.
2. The other typo fixes in the sample inventory are just sort of cosmetic.
   Note: The current install guide and other corresponding metallb yamls are correct within tolerations usage.

Which issue(s) this PR fixes:
NONE

Special notes for your reviewer:
NONE

Does this PR introduce a user-facing change?:

Fixed typos in inventory/sample/group_vars/k8s_cluster 

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: arahmangulov / name: Arthur Rahmangulov (e534e92)

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[mzaian]

Thanks @arahmangulov

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: arahmangulov, mzaian

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