[ADD] Subscription: Created new page 'Subscriptions and payments' #15023
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This is a new page in documentation explaining to users the broad strokes of what they need to know about allowing automatic recurring payments for subscriptions and resolving contract in exception errors. In addition to the new page, it also updates the ToC on the main Subscriptions page and removes the "Contract in exception" language from the Renew Subscriptions page.
This 17.0 PR can be FWP up to master.
Forward-Port-Of: #15022
Forward-Port-Of: #14955