Rocket.chat upstream docs fix

Description of problem:

An OpenShift customer had a lot of trouble getting their Argo CD notifications set up with Rocket.chat. They got in touch with our support team who created an RFE requesting support for Rocket.chat. Though this already exists, Jann was able to identify an error in the customer’s setup that came from the upstream documentation.

See RFE-3863 for details.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

 # <steps>

Actual results:

Expected results:

Reproducibility (Always/Intermittent/Only Once):

Acceptance criteria: 

• Rocket chat config specifies the argocd-notifications-cm ConfigMap instead of argocd-cm
• The rocketchat-email field specifies using the SAMAccountName instead of the user's email address

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):