Update source/handbook/finance/accounting/index.html.md

Cindy Nunezrequested to merge
cnunez-master-patch-52135 into master

Update to AP section due to go live with Tipalti. Once MR is approved I will announce on the company call to give the business a heads up of the change in the process.

cc @llamb @kstithem @mmaradiaga @melissa3 @wilsonlau @daleb04

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