Update upgrade-to-v5.md

[estalldecker]

Fixes #1830

Changes proposed in this pull request

Add an example on how to add conflictBehavior when uploading small files. The example in the official docs don't cover this, it only covers how to upload large files and the method used there to set the property doesn't work for uploading small files.

Other links

• https://learn.microsoft.com/en-us/graph/sdks/large-file-upload?view=graph-rest-1.0&tabs=csharp#upload-large-file-to-onedrive
• https://learn.microsoft.com/en-us/graph/api/resources/driveitem?view=graph-rest-1.0#instance-attributes
• https://learn.microsoft.com/en-us/graph/api/driveitem-put-content?view=graph-rest-1.0&tabs=http

Microsoft Reviewers: Open in CodeFlow

[andrueastman]

Thanks @estalldecker