use https URLs for images

docs/development/setting-up-symbol-server.md

@@ -43,8 +43,8 @@ SRV*c:\code\symbols\*http://msdl.microsoft.com/download/symbols;SRV*c:\code\symb
 
 ## Using the symbol server in Visual Studio
 
-<img src='http://mdn.mozillademos.org/files/733/symbol-server-vc8express-menu.jpg'>
-<img src='http://mdn.mozillademos.org/files/2497/2005_options.gif'>
+<img src='https://mdn.mozillademos.org/files/733/symbol-server-vc8express-menu.jpg'>
+<img src='https://mdn.mozillademos.org/files/2497/2005_options.gif'>
 
 ## Troubleshooting: Symbols will not load
 

docs/tutorial/desktop-environment-integration.md

@@ -65,7 +65,7 @@ the application via JumpList or dock menu, respectively.
 
 __JumpList:__
 
-![JumpList Recent Files](http://i.msdn.microsoft.com/dynimg/IC420538.png)
+![JumpList Recent Files](https://cloud.githubusercontent.com/assets/2289/23446924/11a27b98-fdfc-11e6-8485-cc3b1e86b80a.png)
 
 __Application dock menu:__