Wrong documentation for Payroll AU API

[ChakreshwarSharma]

https://xeroapi.github.io/xero-ruby/payroll_au/index.html#api-PayrollAu-getPayRuns

As per this

  response = xero_client.accounting_api.get_pay_runs(xero_tenant_id, if_modified_since, where, order, page)

Instead it should be

xero_client.payroll_au_api.get_pay_runs(xero_tenant_id, if_modified_since, where, order, page)

This is for all Payroll AU apis, i haven't checked the other APIs.

[github-actions]

PETOSS-890

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