UpdateServicesServer: Fix small typo

[SeanKilleen]

Pull Request (PR) description

Small typo in a comment; just happened to see it while reading through.

This Pull Request (PR) fixes the following issues

Task list

• [ ] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [ ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[SeanKilleen]

@mgreenegit hey! 👋 Let me know if you still need me to enter notes in the unreleased section for the typo etc. It's a 1-character change in a comment so seems like it may not be necessary, but happy to do so if you prefer. Thanks!

[NicolasBn]

Typo already fixed in PR50.