Update description of CheckNodeEligibility option

[bpradipt]

- Description of the problem which is fixed/What is the use case
The current description of the "CheckNodeEligibility" option that is displayed when creating KataConfig via OpenShift UI is misleading.
- What I did
Updated the description to closely aligned with the implementation
- How to verify it
When creating the KataConfig instance, check the description of the "CheckNodeEligibility" option and you should see the following:

"CheckNodeEligibility is used to detect the node(s) eligibility to run Kata containers. 
This is currently done through the use of the Node Feature Discovery Operator (NFD). 
For more information on how the check works, please refer to the sandboxed containers documentation - https://docs.openshift.com/container-platform/latest/sandboxed_containers/deploying-sandboxed-container-workloads.html"

- Description for the changelog
Fix "CheckNodeEligibility" description.

[openshift-ci]

@bpradipt: all tests passed!

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[jensfr]

lgtm, thank you @bpradipt