Editorial: Quick fixes for CreateListFromArrayLike

- Capital 'B' on "Boolean"

- When an operation has an optional parameter X,
  the op doesn't do anything with X until either:
  - it has established that a value was passed to X, or
  - it has established that a value wasn't passed to X,
    and has set X to some value.

spec.html

@@ -6471,14 +6471,15 @@ <h1>
       <h1>
         CreateListFromArrayLike (
           _obj_: an ECMAScript language value,
-          optional _requirePropertyKeys_: a boolean,
+          optional _requirePropertyKeys_: a Boolean,
         ): either a normal completion containing a List of ECMAScript language values or a throw completion
       </h1>
       <dl class="header">
         <dt>description</dt>
         <dd>It is used to create a List value whose elements are provided by the indexed properties of _obj_. _elementTypes_ contains the names of ECMAScript Language Types that are allowed for element values of the List that is created.</dd>
       </dl>
       <emu-alg>
+        1. If _requirePropertyKeys_ is not present, set _requirePropertyKeys_ to *false*.
         1. If _obj_ is not an Object, throw a *TypeError* exception.
         1. Let _len_ be ? LengthOfArrayLike(_obj_).
         1. Let _list_ be a new empty List.