fix: update broken links after restructuring appendix-c

Signed-off-by: Jonathan Norris <[email protected]>

Author: jonathannorris

specification/README.md

@@ -19,7 +19,7 @@ sidebar_position: 0
 - [Tracking](./sections/06-tracking.md)
 - [Appendix A: Included Utilities](./appendix-a-included-utilities.md)
 - [Appendix B: Gherkin Suites](./appendix-b-gherkin-suites.md)
-- [Appendix C: OFREP](./appendix-c-ofrep.md)
+- [Appendix C: OFREP](./appendix-c/index.md)
 - [Appendix D: Observability](./appendix-d-observability.md)
 
 ## Conformance

specification/appendix-c/index.md

@@ -20,4 +20,4 @@ If you are interested in this initiative, you can join the [`#openfeature-remote
 
 ## API Specification
 
-View the full [OFREP API Specification](./ofrep-api) with interactive documentation.
+View the full [OFREP API Specification](./ofrep-api.mdx) with interactive documentation.