message: [fuzzing] coverage needs to run with fuzzing flag enabled
  Closes:
  Approved by: huitseeker
diff: @@ -71,7 +71,7 @@ cargo run --bin investigate -- -i artifacts/compiled_module/crash-5d7f403f
  The following command will run libfuzzer on the relevant target with your input:
  ```
  -// build single fuzzer for target using instruction in the 'google oss-fuzz integration' section
  +# build single fuzzer for target using instruction in the 'google oss-fuzz integration' section
  ./fuzzer input
  ```
  @@ -86,7 +86,7 @@ See [Google OSS-Fuzz's documentation on reproducing bugs](https://google.github.
  To test coverage of our fuzzers you can run the following command with [grcov](https://github.com/mozilla/grcov):
  ```
  -CORPUS_PATH=fuzz/corpus cargo xtest --html-cov-dir <some path for html output> -p libra-fuzzer -- coverage
  +RUSTFLAGS='--cfg feature="fuzzing"' CORPUS_PATH=fuzz/corpus cargo xtest --html-cov-dir <some path for html output> -p libra-fuzzer -- coverage
  ```
  ### Google OSS-Fuzz Integration
  