message: Fix missing code-block
diff: @@ -36,6 +36,8 @@ Libraries only (SDK)
  For Debug, you should set the CRT to **MTd**:
  + .. code-block::
  +
  $ cmake -DCMAKE_BUILD_TYPE=Debug -DLIEF_USE_CRT_DEBUG=MTd ..
  $ cmake --build . --target LIB_LIEF --config Debug
  