docs: fix broken links in guides/choosing-a-test-runner (fixes #53). (#54)

Author: aladdin-add

docs/en/guides/choosing-a-test-runner.md

@@ -33,8 +33,8 @@ The `jest-vue` preprocessor supports basic SFC functionalities, but currently do
 
 Read the following guides for different setups:
 
-- [Testing SFCs with Jest](./guides/testing-SFCs-with-jest.md)
-- [Testing SFCs with Mocha + webpack](./guides/testing-SFCs-with-mocha-webpack.md)
+- [Testing SFCs with Jest](./testing-SFCs-with-jest.md)
+- [Testing SFCs with Mocha + webpack](./testing-SFCs-with-mocha-webpack.md)
 
 ## Resources