Update install script URL

As we don't pass '-L' to curl, the redirect is
	not followed.

Signed-off-by: Daniel Holbach <daniel@weave.works>

docs/dev-guides/source-watcher.md

@@ -28,7 +28,7 @@ kind create cluster --name dev
 Install the Flux CLI:
 
 ```sh
-curl -s https://toolkit.fluxcd.io/install.sh | sudo bash
+curl -s https://fluxcd.io/install.sh | sudo bash
 ```
 
 Verify that your dev machine satisfies the prerequisites with: