Removed the sentence about how NEURON interpret single sample point s…

…omas.

It could be confusing and it doesn't add information as the area of a sphere
and the revolution surface of a cylinder inscribing the sphere are equal.

docs/SONATA_DEVELOPER_GUIDE.md

@@ -113,8 +113,7 @@ The format used is SWC ( [http://www.neuronland.org/NLMorphologyConverter/Morpho
   </tr>
 </table>
 
-* Single sample point soma, interpreted as a sphere with radius from column 6 (**Cylindrical somas are not used**). NEURON interprets single sample somas as
-cylinders with L=radius.
+* Single sample point soma, interpreted as a sphere with radius from column 6 (**Cylindrical somas are not used**).
 
 * Types: The following types are currently used.