Fix typo

Oauth -> OAuth

Author: changeworld

articles/automation/start-runbooks.md

@@ -16,7 +16,7 @@ The following table helps you determine the method to start a runbook in Azure A
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 | [Azure portal](#start-a-runbook-with-the-azure-portal) |<li>Simplest method with interactive user interface.<br> <li>Form to provide simple parameter values.<br> <li>Easily track job state.<br> <li>Access authenticated with Azure sign in. |
 | [Windows PowerShell](/powershell/module/az.automation/start-azautomationrunbook) |<li>Call from command line with Windows PowerShell cmdlets.<br> <li>Can be included in automated feature with multiple steps.<br> <li>Request is authenticated with certificate or OAuth user principal / service principal.<br> <li>Provide simple and complex parameter values.<br> <li>Track job state.<br> <li>Client required to support PowerShell cmdlets. |
-| [Azure Automation API](/rest/api/automation/) |<li>Most flexible method but also most complex.<br> <li>Call from any custom code that can make HTTP requests.<br> <li>Request authenticated with certificate, or Oauth user principal / service principal.<br> <li>Provide simple and complex parameter values. *If you're calling a Python runbook using the API, the JSON payload must be serialized.*<br> <li>Track job state. |
+| [Azure Automation API](/rest/api/automation/) |<li>Most flexible method but also most complex.<br> <li>Call from any custom code that can make HTTP requests.<br> <li>Request authenticated with certificate, or OAuth user principal / service principal.<br> <li>Provide simple and complex parameter values. *If you're calling a Python runbook using the API, the JSON payload must be serialized.*<br> <li>Track job state. |
 | [Webhooks](automation-webhooks.md) |<li>Start runbook from single HTTP request.<br> <li>Authenticated with security token in URL.<br> <li>Client can't override parameter values specified when webhook created. Runbook can define single parameter that is populated with the HTTP request details.<br> <li>No ability to track job state through webhook URL. |
 | [Respond to Azure Alert](/azure/azure-monitor/alerts/alerts-overview) |<li>Start a runbook in response to Azure alert.<br> <li>Configure webhook for runbook and link to alert.<br> <li>Authenticated with security token in URL. |
 | [Schedule](./shared-resources/schedules.md) |<li>Automatically start runbook on hourly, daily, weekly, or monthly schedule.<br> <li>Manipulate schedule through Azure portal, PowerShell cmdlets, or Azure API.<br> <li>Provide parameter values to be used with schedule. |