update one-line docs for svg, gl, audio

sdk/lib/svg/dartium/svg_dartium.dart

+/**
+ * Scalable Vector Graphics:
+ * Two-dimensional vector graphics with support for events and animation.
+ *
+ * For details about the features and syntax of SVG, a W3C standard,
+ * refer to the
+ * [Scalable Vector Graphics Specification](http://www.w3.org/TR/SVG/).
+ */
 library dart.dom.svg;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 import 'dart:_blink' as _blink;
 // DO NOT EDIT
@@ skipping 7511 matching lines @@
   @DocsEditable()
   factory _SVGVKernElement() => _SvgElementFactoryProvider.createSvgElement_tag("vkern");
   /**
    * Constructor instantiated by the DOM when a custom element has been created.
    *
    * This can only be called by subclasses from their created constructor.
    */
   _SVGVKernElement.created() : super.created();
 
 }