Update how-to-build.rst

Changed inline highlights into .. code block for consistency

Added three options for CRC package (as proposed by @rahix )

Documentation/how-to-build.rst

@@ -71,9 +71,26 @@ Dependencies
         brew install ninja
         pip3 install --user meson  # see https://mesonbuild.com/Getting-meson.html - you will have to add ~/.local/bin to your PATH.
 
-* **python3-crc16**: Install with ``pip3 install --user crc16``.
-* **python3-pillow**: Python Image Library ``pip3 install --user pillow``.
+* One of three CRC packages are required. Pick one:
 
+  - for all OS's
+  
+    .. code-block:: shell-session
+        
+        pip3 install --user crc16
+            
+    .. code-block:: shell-session
+        
+        pip3 install --user crcmod
+            
+    .. code-block:: shell-session
+        
+        pip3 install --user crcmod
+        
+* **python3-pillow**: Python Image Library
+       .. code-block:: shell-session
+            pip3 install --user pillow
+        
   - Arch
 
     .. code-block:: shell-session