DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/sdk/Linkifier.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 268 matching lines @@
      * @return {boolean}
      */
     handleLink: function(url, lineNumber) {}
 }
 
 /**
  * @param {!WebInspector.Target} target
  * @param {string} scriptId
  * @param {number} lineNumber
  * @param {number=} columnNumber
+ * @return {string}
  */
 WebInspector.Linkifier.liveLocationText = function(target, scriptId, lineNumber, columnNumber)
 {
     var script = target.debuggerModel.scriptForId(scriptId);
     if (!script)
         return "";
     var uiLocation = script.rawLocationToUILocation(lineNumber, columnNumber);
     return uiLocation.linkText();
 }