docs: Update enable_notifications.rst with initialization details

[Vishwajit-Herma]

Clarified the initialization step required after enabling the notifications plugin, including the necessary command and environment variables.

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[sarina]

@saraburns1 could you take a look at this?

[musaabhasan]

I reviewed the notification setup change from an operator-runbook perspective. The intent is useful, but the command syntax and rebuild note should be tightened so site operators can copy the steps without ambiguity.

[musaabhasan]

This command reads as if dev is fixed and [do/local/k8s] is the placeholder, which would lead operators to run an invalid Tutor command. Existing Tutor patterns use the environment first, then the action, for example tutor local do init --limit=notifications or tutor k8s do init --limit=notifications. I would replace this with two explicit examples rather than a nested placeholder.

[musaabhasan]

This line has extra spacing before notification and is now long enough to be hard to scan in the rendered source. It would also be clearer to separate the sequence into two explicit steps: initialize the notifications plugin first, then rebuild the MFE image so the notification tray is visible.