Fix typo in ML supervised model Problem child package

[alvarezmelissa87]

What does this PR do?

Fixes a small typo in the README of the ProblemChild package - changes Winglogbeat to Winlogbeat.
This package hasn't been published yet so there is no version update requirement.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

Relates to #2115

[elasticmachine]

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• Start Time: 2022-04-07T16:38:22.622+0000

• Duration: 12 min 6 sec

🤖 GitHub comments

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[mtojek]

If you want to release this as a package, you need to bump up the package version and add a changelog entry.

[peteharverson]

LGTM