fix(doc): Cleanup of how to install python deps

Documentation/how-to-build.rst

@@ -63,39 +63,44 @@ Dependencies
     .. code-block:: shell-session
 
        pacman -S meson
-       
-  - macOS 
-  
+
+  - macOS
+
     .. code-block:: shell-session
-            
+
         brew install ninja
         pip3 install --user meson  # see https://mesonbuild.com/Getting-meson.html - you will have to add ~/.local/bin to your PATH.
 
 * One of three CRC packages are required. Pick one:
 
-  - for all OS's
-  
+  - Ubuntu / Debian / macOS
+
     .. code-block:: shell-session
-        
+
         pip3 install --user crc16
-            
+
+or
+
     .. code-block:: shell-session
-        
+
         pip3 install --user crcmod
-            
+
+  - Arch
+
     .. code-block:: shell-session
-        
-        pip3 install --user crcmod
-        
+
+       pacman -S python-crc16
+
 * **python3-pillow**: Python Image Library
        .. code-block:: shell-session
+
             pip3 install --user pillow
-        
+
   - Arch
 
     .. code-block:: shell-session
 
-       pacman -S python-crc16 python-pillow
+       pacman -S python-pillow
 
 .. _ARM's GNU toolchain: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads