Add content-type to Generic Alert docs

What does this MR do?

Since Generic Alert Endpoint expects JSON as a payload it should have a "Content-Type: application/json"

Examples

Before

→ curl --request POST --data '{"title": "Incident title"}' --header "Authorization: Bearer randomtoken" http://localhost:3000/ck3g/playground/alerts/notify


<ActionController::Parameters {"{\"title\": \"Incident title\"}"=>nil, "controller"=>"projects/alerting/notifications", "action"=>"create", "namespace_id"=>"ck3g", "project_id"=>"playground"} permitted: false>

produces invalid parameter

{"{\"title\": \"Incident title\"}"=>nil

After

→ curl --request POST --data '{"title": "Incident title"}' --header "Authorization: Bearer randomtoken" --header "Content-Type: application/json" http://localhost:3000/ck3g/playground/alerts/notify


<ActionController::Parameters {"title"=>"Incident title", "controller"=>"projects/alerting/notifications", "action"=>"create", "namespace_id"=>"ck3g", "project_id"=>"playground", "notification"=>{"title"=>"Incident title"}} permitted: false>

Related to the Generic Alert Endpoint.

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