remove erroneous #

docs/FAQ.md

   _Solution_: Look into the [log
   files](https://docs.unity3d.com/Manual/LogFiles.html) generated by the Unity
   Environment to figure what error happened.
-# _Cause_: You have assigned HTTP_PROXY and HTTPS_PROXY values in your
+ _Cause_: You have assigned HTTP_PROXY and HTTPS_PROXY values in your
   environment variables. _Solution_: Remove these values and try again.
 
 ## Communication port {} still in use