chore: fix broken link (#301)

## Rationale


## Detailed Changes


## Test Plan

CONTRIBUTING.md

@@ -37,7 +37,7 @@ PR title.
 
 For PRs that you consider ready for review, verify the following locally before you submit it:
 
-* you have a coherent set of logical commits, with messages conforming to the [Conventional Commits](https://github.com/apache/incubator-horaedb/docs/conventional-commit.md) specification;
+* you have a coherent set of logical commits, with messages conforming to the [Conventional Commits](https://github.com/apache/incubator-horaedb-docs/blob/main/docs/src/en/dev/conventional_commit.md) specification;
 * all the tests and/or benchmarks pass, including documentation tests;
 * the code is correctly formatted and all linter checks pass; and
 * you haven't left any "code cruft" (commented out code blocks etc).