Update the hello word example link in build_convert.md
Hi @Ferev, Can you please review this PR ? Thank you! Hi @Ferev, Can you please review this PR ? Thank you!
The `evalute_test.cc` has been renamed to `hello_world_test.cc` with the commit https://github.com/tensorflow/tflite-micro/commit/51b11ee5258c3644d3716b8bc27e424b2cf9fdfa hence creating a broken link.