Update third_party_tools.md with relative path

Author: chinglee-iot

.github/third_party_tools.md

@@ -11,4 +11,4 @@ team.
 | Tool | Website | Getting Started |
 |------|---------|-----------------|
 | Code Sonar | [Link](https://codesecure.com/our-products/codesonar/) | [Link](https://github.com/CodeSecure-SE/FreeRTOS-Kernel) |
-| Coverity | [Link](https://www.synopsys.com/software-integrity/security-testing/static-analysis-sast.html) | [Link](examples/coverity/README.md) |
+| Coverity | [Link](https://www.synopsys.com/software-integrity/security-testing/static-analysis-sast.html) | [Link](../examples/coverity/README.md) |