Fixed syntax in handlebars prompt example. Fixed issue #72

[Krzysztof318]

Fixed issue #72

[learn-build-service-prod[bot]]

Learn Build status updates of commit 20a5bd3:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
samples/dotnet/05-Nested-Functions-In-Prompts/Program.cs	:white_check_mark:Succeeded
semantic-kernel/prompts/calling-nested-functions.md	:white_check_mark:Succeeded

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[Krzysztof318]

@microsoft-github-policy-service agree