Correct kubectl operator install for latest version of operator-sdk

Fixes #981


Signed-off-by: Elan Hasson <[email protected]>

content/docs/installation/operator-lifecycle-manager.md

@@ -41,7 +41,7 @@ from the [Krew Kubectl plugins index][] and then use that to install the cert-ma
 ```sh
 operator-sdk olm install
 kubectl krew install operator
-kubectl operator install cert-manager -n operators --channel stable --approval Automatic
+kubectl operator install cert-manager -n cert-manager --channel candidate --approval Automatic --create-operator-group
 ```
 
 You can monitor the progress of the installation as follows: