Update code example in pre-post-events-schedule-maintenance-configuration.md

[josh-martin-1]

Fix webhook creation code. Previously was using New-AzEventGridSystemTopicEventSubscription -Endpoint $PreEventWebhookEndpoint, but -Endpoint is no longer a valid parameter starting in Azure PowerShell 12.3.0 (was supported in Azure PowerShell 11.6.0) - https://learn.microsoft.com/en-us/powershell/module/az.eventgrid/new-azeventgridsystemtopiceventsubscription

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@josh-martin-1 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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Learn Build status updates of commit f582e20:

:bulb: Validation status: suggestions

File	Status	Preview URL	Details
articles/update-manager/pre-post-events-schedule-maintenance-configuration.md	:bulb:Suggestion		Details

articles/update-manager/pre-post-events-schedule-maintenance-configuration.md

• Line 142, Column 69: [Suggestion: preserve-view-not-set - See documentation] You've pinned this link to a specific version of content with the view parameter. It's recommended not to pin a version unless that version is A) not the default view and B) the context is about that version specifically. To proceed with pinning a version add the &preserve-view=true to the URL. Otherwise, remove the view parameter. URL: /rest/api/maintenance/maintenance-configurations/create-or-update?view=rest-maintenance-2023-09-01-preview&tabs=HTTP

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[Jak-MS]

@SnehaSudhirG Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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