message: Fix "OS dependencies" documentation link
diff: ## Core Dev Documentation
  - [Improve Rust compile times with sccache](core-devs/Improve_Rust_compile_times_with_sccache.md)
  -- [OS dependencies](OS_dependencies.md)
  +- [OS dependencies](core-devs/OS_dependencies.md)
  - [QA onboarding validator](core-devs/QA_onboarding_validator.md)
  - [QA release testing on devnet](core-devs/QA_release_testing_on_devnet.md)
  - [ZKP info](core-devs/ZKP_info.md)
  