Correct parameter name in MacOS install script (#325)

* Fix: Correct last parameter name in script

* Doc: Format install part and correct few typos

Author: simonlegrand

bin/compile-version-MacOS

@@ -131,14 +131,14 @@ make install
 )
 test -f $prefix/bin/h5c++ || (
 cd hdf5-$VERSION_HDF5
-./configure '--enable-cxx' 'CC=clang' 'CXX=clang++' --prefix=$prefix $addconfig
+./configure '--enable-cxx' 'CC=clang' 'CXX=clang++' --prefix=$prefix $addconf
 make -j $njob
 make install 
 )
 
 #test -f $prefix/lib/pkgconfig/mpich.pc || (
 #cd mpich-$VERSION_MPI
-#./configure  --prefix=$prefix "FFLAGS=-fallow-argument-mismatch -L$prefix/gnu -lgfortran -lquadmath" 'CC=clang' 'CXX=clang++' $addconfig
+#./configure  --prefix=$prefix "FFLAGS=-fallow-argument-mismatch -L$prefix/gnu -lgfortran -lquadmath" 'CC=clang' 'CXX=clang++' $addconf
 #make -j $njob
 #make install 
 #)
@@ -154,7 +154,7 @@ echo2 ================================
 export PATH=$prefix/bin:$PATH
 #autoreconf -i
 tar zxvf AutoGeneratedFile.tar.gz 
-./configure "--prefix=$prefix" '--enable-download' $optionconf '--enable-m64' 'CXXFLAGS=-Wno-undefined-var-template' "FLIBS=-L$prefix/gnu -lgfortran -lquadmath  -Wl,-ld_classic" $addconfig
+./configure "--prefix=$prefix" '--enable-download' $optionconf '--enable-m64' 'CXXFLAGS=-Wno-undefined-var-template' "FLIBS=-L$prefix/gnu -lgfortran -lquadmath  -Wl,-ld_classic" $addconf
 echo2 ================================
 echo2 compilation de petc 
 echo2 ================================

readme/README_MAC.md

@@ -21,28 +21,36 @@
 
 ##  Sep 2023
 
-the mac version is compile wit the script 
- bin/compile-version-MacOS  gitbranch  path-where-to-compile configure-parameter
- 
- configure-parameter compilation:
- generic for --enable-genenic
- debug for --enable-debug
- optim for --enable-optim
+The mac version is compiled with the script:
+
+``` bash
+bin/compile-version-MacOS gitbranch path-where-to-compile configure-parameter
+```
+
+`configure-parameter` can take the following values:
+
++ generic for --enable-generic
++ debug for --enable-debug
++ optim for --enable-optim
 
- and exact :
-  bin/compile-version-MacOS master $HOME/tmp generic 
+and exact:
+```bash
+bin/compile-version-MacOS master $HOME/tmp generic
+```
+
 ## Feb 2022
 
-The Version 4.10 is compiled Under Monteray (Apple M1: arm64e) and on (Apple : x86 )
+The Version 4.10 is compiled Under Monteray (Apple M1: arm64e) and on (Apple : x86)
 
 ### for Apple M1 (arm64e)
 
-Add with home brew 
-1. install brew  see
-[install Homebrew]{https://brew.sh/index_fr}
+Add with Homebrew 
+
+1. Install Homebrew
+
+See [install Homebrew](https://brew.sh/index_fr)
 
-    
-2. install this brew package to compile FreeFEM++
+2. Install these brew packages to compile FreeFEM++
 
 ```bash
 brew install \
@@ -64,7 +72,7 @@ gd				isl				libunistring	[email protected]		zip \
 gdbm			jansson			libvmaf			p11-kit			zstd 
 ```
 
-3. download the sources of  FreeFEM++ with git 
+3. Download the sources of FreeFEM++ with git 
 
 	```bash
 	git clone [email protected]:FreeFem/FreeFem-sources.git ff++
@@ -74,7 +82,7 @@ or the develop version
 	```bash
 	git clone -b develop   [email protected]:FreeFem/FreeFem-sources.git ff++
 	```
-4. Compile FreeFem++ without petsc and MPI
+4. Compile FreeFem++ without PETSc and MPI
 
 	```bash
 	cd ff++