Update DEVGUIDE.md (#6950)

Author: ShalokShalom

DEVGUIDE.md

@@ -4,7 +4,7 @@
 
 Get the latest source code from the master branch by running this git command:
 
-    git clone https://github.com/Microsoft/visualfsharp.git
+    git clone https://github.com/dotnet/fsharp.git
 
 Before running the build scripts, ensure that you have cleaned up the visualfsharp repo by running this git command: