Replace ActionResult with ActionResultOfT

[gathogojr]

Replace ActionResult with ActionResult<T> in code samples where a controller action returns a value. Justification: Improved type-checking

RE: https://github.com/OData/AspNetCoreOData/issues/805#issuecomment-1428128420

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

Learn Build status updates of commit cda91d0:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Odata-docs/webapi-8/fundamentals/action-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/entity-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/entityset-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/function-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/navigation-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/property-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/routing-overview.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/fundamentals/singleton-routing.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/getting-started.md	:white_check_mark:Succeeded	View
Odata-docs/webapi-8/tutorials/basic-crud.md	:white_check_mark:Succeeded	View

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