Fix "Building KiCad from Source" developers documentation.

* Change command blocks from using ``` to delineate block and use indentation
  instead.  The ``` method seems to be broken on Doxygen 1.8.9.1 used by the
  autobuilder.  It also removes the line numbering which did not make sense
  for commands that spanned multiple lines.

Documentation/development/compiling.md

@@ -208,21 +208,19 @@ Github mirror: https://github.com/KiCad/kicad-source-mirror
 
 # Building KiCad on Linux # {#build_linux}
 
-To full KiCad build on Linux, do the following:
+To perfrom a full build on Linux, run the following commands:
 
-```
-cd kicad_source_tree
-mkdir -p build/release
-mkdir build/debug               # Optional for debug build.
-cd build/release
-cmake -DCMAKE_BUILD_TYPE=Release     \
+    cd kicad_source_tree
+    mkdir -p build/release
+    mkdir build/debug               # Optional for debug build.
+    cd build/release
+    cmake -DCMAKE_BUILD_TYPE=Release \
           -DKICAD_SCRIPTING=ON \
           -DKICAD_SCRIPTING_MODULES=ON \
           -DKICAD_SCRIPTING_WXPYTHON=ON \
           ../../
-make
-sudo make install
-```
+    make
+    sudo make install
 
 If the CMake configuration fails, determine the missing dependencies and install them on your
 system.  By default, CMake sets the install path on Linux to /usr/local.  Use the
@@ -247,14 +245,12 @@ The easiest way to build KiCad using the [MSYS2][] build environment is to use t
 development branch.  To build the KiCad package, run the `msys2_shell.bat` file located in the
 MSYS2 install path and run the following commands:
 
-```
-pacman -S git
-mkdir src
-cd src
-git clone https://github.com/Alexpux/MINGW-packages
-cd MinGW-packages/mingw-w64-kicad-git
-makepkg-mingw -is
-```
+    pacman -S git
+    mkdir src
+    cd src
+    git clone https://github.com/Alexpux/MINGW-packages
+    cd MinGW-packages/mingw-w64-kicad-git
+    makepkg-mingw -is
 
 This will download and install all of the build dependencies, clone the KiCad source mirror
 from Github, create both 32-bit and 64-bit KiCad packages depending on your MSYS setup, and
@@ -268,8 +264,7 @@ method of building KiCad, your task is significantly more involved.  For 64 bit
 the `mingw64_shell.bat` file located in the MSYS2 install path.  At the command prompt run the
 the following commands:
 
-```
-pacman -S mingw-w64-x86_64-cmake \
+    pacman -S mingw-w64-x86_64-cmake \
               mingw-w64-x86_64-doxygen \
               mingw-w64-x86_64-gcc \
               mingw-w64-x86_64-python2 \
@@ -281,11 +276,11 @@ pacman -S mingw-w64-x86_64-cmake \
               mingw-w64-x86_64-openssl \
               mingw-w64-x86_64-wxPython \
               mingw-w64-x86_64-wxWidgets
-cd kicad-source
-mkdir -p build/release
-mkdir build/debug               # Optional for debug build.
-cd build/release
-cmake -DCMAKE_BUILD_TYPE=Release \
+    cd kicad-source
+    mkdir -p build/release
+    mkdir build/debug               # Optional for debug build.
+    cd build/release
+    cmake -DCMAKE_BUILD_TYPE=Release \
           -G "MSYS Makefiles" \
           -DCMAKE_PREFIX_PATH=/mingw64 \
           -DCMAKE_INSTALL_PREFIX=/mingw64 \
@@ -296,8 +291,7 @@ cmake -DCMAKE_BUILD_TYPE=Release \
           -DKICAD_SCRIPTING_MODULES=ON \
           -DKICAD_SCRIPTING_WXPYTHON=ON \
           ../../
-make install
-```
+    make install
 
 # Building KiCad on OSX # {#build_osx}
 
@@ -307,17 +301,16 @@ building KiCad on OSX, see the [OSX bundle build scripts][].
 
 Download the wxPython source and build using the following commands:
 
-```
-cd path-to-wxwidgets-src
-patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx.patch
-patch -p0 < path-to-kicad-src/wxwidgets-3.0.0_macosx_bug_15908.patch
-patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx_soname.patch
-patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.2_macosx_yosemite.patch
-patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx_scrolledwindow.patch
-mkdir build
-cd build
-export MAC_OS_X_VERSION_MIN_REQUIRED=10.7
-../configure \
+    cd path-to-wxwidgets-src
+    patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx.patch
+    patch -p0 < path-to-kicad-src/wxwidgets-3.0.0_macosx_bug_15908.patch
+    patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx_soname.patch
+    patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.2_macosx_yosemite.patch
+    patch -p0 < path-to-kicad-src/patches/wxwidgets-3.0.0_macosx_scrolledwindow.patch
+    mkdir build
+    cd build
+    export MAC_OS_X_VERSION_MIN_REQUIRED=10.7
+    ../configure \
         --prefix=`pwd`/../wx-bin \
         --with-opengl \
         --enable-aui \
@@ -335,16 +328,14 @@ export MAC_OS_X_VERSION_MIN_REQUIRED=10.7
         --enable-universal-binary=i386,x86_64 \
         CC=clang \
         CXX=clang++
-```
 
 Build KiCad using the following commands:
 
-```
-cd kicad-source
-mkdir -p build/release
-mkdir build/debug               # Optional for debug build.
-cd build/release
-cmake -DCMAKE_C_COMPILER=clang \
+    cd kicad-source
+    mkdir -p build/release
+    mkdir build/debug               # Optional for debug build.
+    cd build/release
+    cmake -DCMAKE_C_COMPILER=clang \
           -DCMAKE_CXX_COMPILER=clang++ \
           -DCMAKE_OSX_DEPLOYMENT_TARGET=10.7 \
           -DwxWidgets_CONFIG_EXECUTABLE=path-to-wx-install/bin/wx-config \
@@ -356,9 +347,8 @@ cmake -DCMAKE_C_COMPILER=clang \
           -DCMAKE_INSTALL_PREFIX=../bin \
           -DCMAKE_BUILD_TYPE=Release \
           ../../
-make
-make install
-```
+    make
+    make install
 
 [download]: http://kicad-pcb.org/download/
 [KiCad website]: http://kicad-pcb.org/