message: Fix title inconsistencies
diff: -# Elle, *the coroutine-based asynchronous C++ development framework.*
  +# Elle, *the coroutine-based asynchronous C++ development framework*
  <img src="docs/static_files/elle_docker_logotype@2x.png" alt="Logo - Elle" title="Elle logotype" width="300" style="max-width:300px;">
  @@ -33,7 +33,7 @@ std::cout << elle::json::pretty_print(elle::json::read(r)) << std::endl;
  ```
  <!-- Full example [here](elle/src/elle/examples/samples/get_wikipedia.cc). -->
  -## Getting Elle.
  +## Getting Elle
  To download the source code and build Elle by yourself, get it from GitHub.
  