Update AD-Build.md

Author: talbring

_docs/AD-Build.md

@@ -10,7 +10,7 @@ The following requires a compiler which supports most of the C++11 features, i.e
 In order to use the discrete adjoint solver the compilation requires two additional (header-only) libraries. [CoDi](https://github.com/SciCompKL/CoDiPack) provides the AD datatype and [MeDi](https://github.com/SciCompKL/MeDiPack) provides the infrastructure for the MPI communication when the reverse mode of AD is used. Both libraries are added as submodules in `externals/` in the git repository of SU2. 
 
 ## Configuration with AD support
-The initialization and compilation of these libraries as well as the configuration of SU2 is handled by the python script `preconfigure.py` inside the main directory. This script accepts the **same arguments** as the usual configure script (except `CXXFLAGS=...`) but in addition it offers the option `--enable-autodiff` to enable AD (reverse mode) for the discrete adjoint solver.
+The initialization of these libraries as well as the configuration of SU2 is handled by the python script `preconfigure.py` inside the main directory. This script accepts the **same arguments** as the usual configure script (except `CXXFLAGS=...`) but in addition it offers the option `--enable-autodiff` to enable AD (reverse mode) for the discrete adjoint solver.
 
 ### Example 
 Assume that your configuration (see [Simple Build](/docs/Simple-Build/) or [Parallel Build](/docs/Parallel-Build/)) is done using the command: