Fix small typo and format better. (#9195)

Author: adrpo

README.cmake.md

@@ -66,14 +66,14 @@ On macOS you need to install:
 - macports: https://guide.macports.org/#installing.macports
   ```sudo port install cmake ccache qt5 qt5-qtwebkit autoconf boost OpenSceneGraph gfortran```
 - Compile OpenModelica via:
-```
-git clone https://github.com/OpenModelica/OpenModelica.git --recursive
-cd OpenModelica
-cmake -S . -B build_cmake -DCMAKE_PREFIX_PATH=/opt/local -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DOM_OMC_ENABLE_FORTRAN=OFF -DOM_OMC_ENABLE_IPOPT=OFF
-cmake --build build_cmake --parallel 10 --target install
-```
+  ```
+  git clone https://github.com/OpenModelica/OpenModelica.git --recursive
+  cd OpenModelica
+  cmake -S . -B build_cmake -DCMAKE_PREFIX_PATH=/opt/local -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DOM_OMC_ENABLE_FORTRAN=OFF -DOM_OMC_ENABLE_IPOPT=OFF
+  cmake --build build_cmake --parallel 10 --target install
+  ```
 
-It some of the above instructions fail, read on below.
+If some of the above instructions fail, read on below.
 On macOS there are a few pitfalls/issues which need attention.
 
 - if building simulation code fails go OMEdit -> Preferences -> Simulation and change the C / C++ compiler to gcc/g++.