Remove outdated BigInt support FIXME from JSTypedArray (#187)

The linked issue has already been closed, so this comment doesn't seem to be relevant.

Author: MaxDesiatov

Sources/JavaScriptKit/BasicObjects/JSTypedArray.swift

@@ -10,8 +10,8 @@ public protocol TypedArrayElement: ConvertibleToJSValue, ConstructibleFromJSValu
     static var typedArrayClass: JSFunction { get }
 }
 
-/// A wrapper around all JavaScript [TypedArray](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/TypedArray) classes that exposes their properties in a type-safe way.
-/// FIXME: [BigInt-based TypedArrays are currently not supported](https://github.com/swiftwasm/JavaScriptKit/issues/56).
+/// A wrapper around all JavaScript [TypedArray](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/TypedArray)
+/// classes that exposes their properties in a type-safe way.
 public class JSTypedArray<Element>: JSBridgedClass, ExpressibleByArrayLiteral where Element: TypedArrayElement {
     public class var constructor: JSFunction { Element.typedArrayClass }
     public var jsObject: JSObject