Document TypedArray’s set() method (#84)

Author: FGasper

src/stdlib/typedarray.md

@@ -145,6 +145,11 @@ The TypedArray API works very much like JavaScript's \([MDN](https://developer.m
   ```
   Reverses an array's values in place, modifying the array before returning it.
 
+* ```ts
+  function set(source: TypedArray, offset?: i32): void
+  ```
+  Sets the typed array values (starting at `offset`, or 0), reading input values from a specified `source` typed array.
+
 * ```ts
   function some(
     fn: (value: T, index: i32, self: TypedArray) => bool