Update ADL_SDK/readme.txt

fixed the link

ADL_SDK/readme.txt

@@ -1,3 +1,2 @@
 Please insert AMD ADL files adl_defines.h adl_sdk.h adl_structures.h here.
-They can be found here:
-http://developer.amd.com/sdks/ADLSDK/Pages/default.aspx
+They can be found here: http://developer.amd.com/tools/graphics-development/display-library-adl-sdk/