Update spec references to use canonical source

CONTRIBUTING.md

@@ -116,7 +116,7 @@ This tag is for boolean properties associated with the test.
 - **`onlyStrict`** - only run the test in strict mode (*not supported by the browser runner*)
 - **`noStrict`** - only run the test in "sloppy" mode
 - **`module`** - interpret the source text as [module
-  code](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-modules)
+  code](http://www.ecma-international.org/ecma-262/6.0/#sec-modules)
 
 #### features
 **features**: [list]
@@ -133,8 +133,8 @@ Test262Error(message) | constructor for an error object that indicates a test fa
 $ERROR(message) | construct a Test262Error object and throw it
 $DONE(arg) | see Writing Asynchronous Tests, below
 assert(value, message) | throw a new Test262Error instance if the specified value is not strictly equal to the JavaScript `true` value; accepts an optional string message for use in creating the error
-assert.sameValue(actual, expected, message) | throw a new Test262Error instance if the first two arguments are not [the same value](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevalue); accepts an optional string message for use in creating the error
-assert.notSameValue(actual, unexpected, message) | throw a new Test262Error instance if the first two arguments are [the same value](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevalue); accepts an optional string message for use in creating the error
+assert.sameValue(actual, expected, message) | throw a new Test262Error instance if the first two arguments are not [the same value](http://www.ecma-international.org/ecma-262/6.0/#sec-samevalue); accepts an optional string message for use in creating the error
+assert.notSameValue(actual, unexpected, message) | throw a new Test262Error instance if the first two arguments are [the same value](http://www.ecma-international.org/ecma-262/6.0/#sec-samevalue); accepts an optional string message for use in creating the error
 assert.throws(expectedErrorConstructor, fn) | throw a new Test262Error instance if the provided function does not throw an error, or if the constructor of the value thrown does not match the provided constructor
 
 The test harness also defines the following objects: