README.md: fixes to compilation instructions under Windows/MSYS2

(cherry picked from commit 69ea03b5)

README.md

@@ -262,26 +262,25 @@ pacman -Syu
 ```
 pacman -S git autoconf automake-wrapper bison flex make tar texinfo mingw-w64-x86_64-gcc mingw-w64-x86_64-gcc-fortran mingw-w64-x86_64-boost mingw-w64-x86_64-gsl mingw-w64-x86_64-matio mingw-w64-x86_64-openblas
 ```
-- **(Optional)** compile and install SLICOT, needed for the `kalman_steady_state`
-  MEX file
+- Compile and install SLICOT, needed for the `kalman_steady_state` MEX file
 ```
 wget https://deb.debian.org/debian/pool/main/s/slicot/slicot_5.0+20101122.orig.tar.gz
 tar xf slicot_5.0+20101122.orig.tar.gz
 cd slicot-5.0+20101122
-make FORTRAN=gfortran OPTS="-O2 -fno-underscoring -fdefault-integer-8" LOADER=gfortran slicot.a
+make FORTRAN=gfortran OPTS="-O2 -fno-underscoring -fdefault-integer-8" LOADER=gfortran lib
 mkdir -p /usr/local/lib
 cp slicot.a /usr/local/lib/libslicot64_pic.a
 cd ..
 ```
-- Clone and prepare the Dynare sources:
+- Prepare the Dynare sources, either by unpacking the source tarball, or with:
 ```
 git clone --recurse-submodules https://git.dynare.org/Dynare/dynare.git
 cd dynare
 autoreconf -si
 ```
-- Configure Dynare:
+- Configure Dynare from the source directory:
 ```
-./configure --with-slicot=/usr/local --with-matlab=<…> MATLAB_VERSION=<…> --disable-octave
+./configure --with-slicot=/usr/local --with-matlab=<…> MATLAB_VERSION=<…> --disable-octave --disable-doc
 ```
 where the path and version of MATLAB are specified. Note that you should use
 the MSYS2 notation and not put spaces in the MATLAB path, so you probably want