Update docs

readthedocs/ravi-mir-instructions.rst

@@ -1,18 +1,18 @@
 Instructions for Building With MIR JIT support
 ==============================================
 
-Building with MIR support is straightforward as MIR is included in Ravi::
+Building with MIR support is straightforward as MIR is included in Ravi. On Linux or Mac OSX::
 
-   mkdir buildmir
-   cd buildmir
-   cmake -DCMAKE_INSTALL_PREFIX=$HOME/ravi -DCMAKE_BUILD_TYPE=Release -G "Unix Makefiles" -DMIR_JIT=ON ..
+   mkdir build
+   cd build
+   cmake -DCMAKE_INSTALL_PREFIX=$HOME/Software/ravi -DCMAKE_BUILD_TYPE=Release ..
    make install
    
 That's it. 
 
-For Windows, try this::
+For Windows, assuming you have Visual Studio 2019 installed, you can build as follows::
 
-   mkdir buildmir
-   cd buildmir
-   cmake -DCMAKE_INSTALL_PREFIX=/Software/ravi -DCMAKE_BUILD_TYPE=Release -DMIR_JIT=ON ..
+   mkdir build
+   cd build
+   cmake -DCMAKE_INSTALL_PREFIX=/Software/ravi -DCMAKE_BUILD_TYPE=Release ..
    cmake --build . --config Release