Specs: fix a raft of syntax errors caught by actually running a syntax checker...

sky/specs/script.md

 Sky Script Language
 ===================
 
 The Sky script language is Dart.
 
 The way that Sky integrates the module system with its script language
 is described in [modules.md](modules.md).
 
 All the APIs defined in this documentation, unless explicitly called
 out as being in a framework, are in the `dart:sky` built-in module.
 
 When a method in `dart:sky` defined as ``external`` receives an
 argument, it must type-check it, and, if the argument's value is the
 wrong type, then it must throw an ArgumentError as follows:
 
    throw new ArgumentError(value, name: name);
 
 ...where "name" is the name of the argument. Type checking here
 includes rejecting nulls unless otherwise indicated or unless null is
 argument's default value.
 
 The following definitions are exposed in ``dart:sky``:
 
 ```dart
+import 'dart:mirrors';
+
 abstract class AutomaticMetadata {
   const AutomaticMetadata();
   void init(DeclarationMirror target, Module module);
 
   static void runLibrary(LibraryMirror library, Module module) {
     library.declarations.values.toList() /* ..sort((DeclarationMirror a, DeclarationMirror b) {
       bool aHasLocation;
       try {
         aHasLocation = a.location != null;
       } catch(e) {
@@ skipping 54 matching lines @@
   syntax for defining this is, within the class body for a class
   called ClassName:
 
 ```dart
      ClassName = SuperclassName;
      ClassName.namedConstructor = SuperclassName.otherNamedConstructor;
 ```
 
 * The reflection APIs (`dart:mirrors`) are assumed to reflect a
   library's declarations in source order.