Clarify generic vs specific route registration

[gathogojr]

Clarify generic vs specific route registration

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

Learn Build status updates of commit 2125a79:

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

Learn Build status updates of commit b43a225:

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

Learn Build status updates of commit 17a938a:

:white_check_mark: Validation status: passed

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Odata-docs/webapi-8/fundamentals/overview.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel