Clarify World:interpolate alpha range;

api/init.lua

@@ -40440,7 +40440,7 @@ return {
                     {
                       name = "alpha",
                       type = "number",
-                      description = "The interpolation parameter.  An alpha of zero will use the previous collider pose, an alpha of 1.0 will use the latest collider pose, etc."
+                      description = "The interpolation parameter.  An alpha of zero will use the previous collider pose, an alpha of 1.0 will use the latest collider pose, etc.  Can be less than zero or greater than one."
                     }
                   },
                   returns = {}

api/lovr/physics/World/interpolate.lua

@@ -17,7 +17,7 @@ return {
       type = 'number',
       description = [[
         The interpolation parameter.  An alpha of zero will use the previous collider pose, an alpha
-        of 1.0 will use the latest collider pose, etc.
+        of 1.0 will use the latest collider pose, etc.  Can be less than zero or greater than one.
       ]]
     }
   },