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

Source/devtools/front_end/common/TextRange.js

 /*
  * Copyright (C) 2013 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 25 matching lines @@
  * @param {number} endColumn
  */
 WebInspector.TextRange = function(startLine, startColumn, endLine, endColumn)
 {
     this.startLine = startLine;
     this.startColumn = startColumn;
     this.endLine = endLine;
     this.endColumn = endColumn;
 }
 
+/**
+ * @param {number} line
+ * @param {number} column
+ * @return {!WebInspector.TextRange}
+ */
 WebInspector.TextRange.createFromLocation = function(line, column)
 {
     return new WebInspector.TextRange(line, column, line, column);
 }
 
 /**
  * @param {!Object} serializedTextRange
  * @return {!WebInspector.TextRange}
  */
 WebInspector.TextRange.fromObject = function(serializedTextRange)
@@ skipping 179 matching lines @@
 /**
  * @constructor
  * @param {number} offset
  * @param {number} length
  */
 WebInspector.SourceRange = function(offset, length)
 {
     this.offset = offset;
     this.length = length;
 }