docs: add List.filled and List.new constructors to core module docs

doc/site/modules/core/fiber.markdown

@@ -4,6 +4,12 @@ A lightweight coroutine. [Here][fibers] is a gentle introduction.
 
 [fibers]: ../../concurrency.html
 
+## Static Methods
+
+### Fiber.**current**
+
+The currently executing fiber.
+
 ### Fiber.**new**(function)
 
 Creates a new fiber that executes `function` in a separate coroutine when the
@@ -14,12 +20,6 @@ fiber is run. Does not immediately start running the fiber.
       System.print("I won't get printed")
     }
 
-## Static Methods
-
-### Fiber.**current**
-
-The currently executing fiber.
-
 ### Fiber.**suspend**()
 
 Pauses the current fiber, and stops the interpreter. Control returns to the