All: Remove mentions of MS-provided Windows images with IE

Microsoft no longer provides such images.

Closes gh-233

Author: mgol

pages/browser-support.html

@@ -39,7 +39,7 @@ <h2>Unsupported Browsers</h2>
 <hr>
 
 <h2>About Browser Support</h2>
-<p>jQuery is constantly tested with all of its supported browsers via unit tests. However, a web page using jQuery may not work in the same set of browsers if its own code takes advantage of (or falls prey to) browser-specific behaviors. Testing is essential to fully support a browser. The Microsoft Edge Developer site makes available <a href="https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/">virtual machines</a> for testing many versions of Internet Explorer.
+<p>jQuery is constantly tested with all of its supported browsers via unit tests. However, a web page using jQuery may not work in the same set of browsers if its own code takes advantage of (or falls prey to) browser-specific behaviors. Testing is essential to fully support a browser.
 
 <p>Only the most current version of jQuery is tested and updated to fix bugs or add features. Users of older versions that find a bug should upgrade to the latest released version to determine if the bug has already been fixed. The <a href="https://github.com/jquery/jquery-migrate/#readme">jQuery Migrate plugin</a> may be helpful in identifying and fixing problems during a version upgrade.</p>
 

pages/download.md

@@ -75,10 +75,6 @@ The second version helps you update code to run on jQuery 3.0 or higher, *once y
 
 <a href="https://code.jquery.com/jquery-migrate-3.4.0.js" download>Download the uncompressed, development jQuery Migrate 3.4.0</a>
 
-## Cross-Browser Testing with jQuery
-
-Be sure to test web pages that use jQuery in all the browsers you want to support. The [Microsoft Developer Resources](https://developer.microsoft.com/en-us/microsoft-edge/) site makes available [virtual machines](https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/) for testing many versions of Internet Explorer.
-
 ## jQuery Pre-Release Builds
 
 The jQuery team is constantly working to improve the code. Each commit to the Github repo generates a work-in-progress version of the code that we update on the jQuery CDN. _These versions are sometimes unstable and never suitable for production sites._ We recommend they be used to determine whether a bug has already been fixed when reporting bugs against released versions, or to see if new bugs have been introduced.