doc: add information about support in Funtoo

Change-Id: I7beab5fafb494cd2c8cb60bda5f01a3f73f9758f
Signed-off-by: Jacek Danecki <jacek.danecki@intel.com>

Author: JacekDanecki

documentation/Neo_in_distributions.md

@@ -34,7 +34,7 @@ dnf copr enable jdanecki/intel-opencl
 dnf install intel-opencl
 ```
 
-## Gentoo*
+## Gentoo*, Funtoo*
 
 ```
 emerge intel-neo