Fix display of hedings in README.md (nw)

Author: couriersud

README.md

@@ -17,20 +17,24 @@
   * [DOxygen](#optional-doxygen)  
 
 <a name="introduction"/>
+
 ## Introduction
 The MAME development environment for Windows consists of the GCC compiler (by way of MinGW), and the MSYS2 (POSIX/Unix compatability layer), plus various utilities such as Python and Git. It is available as a prepackaged installer, or can be assembled from upstream components. 
 
 Source control is handled by github (***https://github.com/mamedev/mame.git***), so you'll need to check out a copy.
 Various modules are disabled by default, but can be enabled through arguments when building and may require additional MSYS2 packages to be installed.
 
 <a name="installandbuild"/>
+
 ## Installation and building
 
 <a name="downloads"/>
+
 ### Downloads
 * Dual 32-bit/64-bit - [msys64-32-2019-12-23.exe](https://github.com/mamedev/buildtools/releases/download/5.0/msys64-32-2019-12-23.exe) _(If you have 64-bit Windows but wish to build for both 32-bit and 64-bit. To switch between different mingw versions use **config32.bat** and **config64.bat**)_
 
 <a name="installation"/>
+
 ### Installation
 If you are installing it in a location other than the default (*c:\msys64* or *c:\msys32*), after you unpack double-click : **autorebase.bat**
 
@@ -48,6 +52,7 @@ git config --global user.name "Firstname Lastname"
 ```
 
 <a name="building"/>
+
 ### Building
 Then, to download the MAME source under your Msys2 user's homedir:
 ```sh
@@ -65,6 +70,7 @@ make
 ```
 
 <a name="updating"/>
+
 ## Updating build tools
 
 Similar to package managers on Linux like apt-get, yum etc. MSYS2 can automatically update packages for fixes, security updates etc.
@@ -82,15 +88,18 @@ pacman -Su --noconfirm
 ```
 
 <a name="advanced"/>
+
 ## Alternative Shells for advanced usage
 For a simple MSYS32 terminal use **mingw64.exe** to start or **mingw32.exe** . 
 
 For more information about Msys2, see [MSYS2 Introduction](https://github.com/msys2/msys2/wiki/MSYS2-introduction). 
 
 <a name="optional"/>
+
 ## Optional additional packages
 
 <a name="optional-sdl"/>
+
 ### SDL
 If you wish to build with the SDL renderer:
 
@@ -105,6 +114,7 @@ If you wish to build with the SDL renderer:
    ```
 
 <a name="optional-qt5"/>
+
 ### QT5
 If you wish to build with the QT5 debugger:
 
@@ -119,6 +129,7 @@ If you wish to build with the QT5 debugger:
    ```
 
 <a name="optional-qt4"/>
+
 ### QT4
 If you with to build the QMC2 frontend or similar:
 
@@ -133,6 +144,7 @@ If you with to build the QMC2 frontend or similar:
    ```
 
 <a name="optional-doxygen"/>
+
 ### Doxygen
 To be able to generate the documentation from the source:
 
@@ -141,6 +153,7 @@ To be able to generate the documentation from the source:
    ```
 
 <a name="optional-ccache"/>
+
 ### CCache
 To be able to use ccache to speed-up (re)compilation
 
@@ -154,6 +167,7 @@ To be able to use ccache to speed-up (re)compilation
    pacman -S mingw-w64-i686-ccache 
    ```
 <a name="optional-ccache"/>
+
 ### CMake
 Used as build system for some other project that can be handy
 
@@ -177,6 +191,7 @@ Used as build system for some other project that can be handy
    ```
 
 <a name="optional-clang"/>
+
 ### Clang
 If you wish to compile/link with the alternative Clang, go ahead and download: