Update long.adoc

Changed the Speed of light to referenced in Km/s instead of Miles/s. 
Reverted to Using "Parameters" instead of "description" for heading again.

Author: kengdahl

Language/Variables/Data Types/long.adoc

@@ -28,7 +28,7 @@ If doing math with integers at least one of the values must be of type long, eit
 
 
 [float]
-=== Description
+=== Parameters
 `var`: variable name. +
 `val`: the value assigned to the variable.