message: fixed another broken link
diff: @@ -55,7 +55,7 @@ The **key** differences between it and other testing frameworks are that it is l
  - Ultra light on compile times both in terms of [**including the header**](doc/markdown/benchmarks.md#cost-of-including-the-header) and writing [**thousands of asserts**](doc/markdown/benchmarks.md#cost-of-an-assertion-macro)
  - Doesn't produce any warnings even on the [**most aggressive**](scripts/cmake/common.cmake#L84) warning levels for **MSVC**/**GCC**/**Clang**
  - Offers a way to remove **everything** testing-related from the binary with the [**```DOCTEST_CONFIG_DISABLE```**](doc/markdown/configuration.md#doctest_config_disable) identifier
  -- [**thread-safe**](faq.md#is-doctest-thread-aware) - asserts (and logging) can be used from multiple threads spawned from a single test case - [**example**](examples/all_features/concurrency.cpp)
  +- [**thread-safe**](doc/markdown/faq.md#is-doctest-thread-aware) - asserts (and logging) can be used from multiple threads spawned from a single test case - [**example**](examples/all_features/concurrency.cpp)
  - asserts can be used [**outside of a testing context**](doc/markdown/assertions.md#using-asserts-out-of-a-testing-context) - as a general purpose assert library - [**example**](examples/all_features/asserts_used_outside_of_tests.cpp)
  - Doesn't pollute the global namespace (everything is in namespace ```doctest```) and doesn't drag **any** headers with it
  - Very [**portable**](doc/markdown/features.md#extremely-portable) C++11 (use tag [**1.2.9**](https://github.com/onqtam/doctest/tree/1.2.9) for C++98) with over 180 different CI builds (static analysis, sanitizers...)
  