removing unnecessary line breaks

Author: andrewconnell

docs/apis/migration-api-whats-new.md

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 Check here to see what features or updates have been added to the Migration API. Here's a summary of what's included.
 
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 ## New: Speed up small file migration
 
 The migration package includes multiple files, which are each uploaded/downloaded individually. If you have a large number of small-sized files, migration speed drops dramatically. By using the new **ArchivedFiles.XML** file in your prime package you can transfer files in batch resulting in a faster migration. [Learn more about using the ArchivedFiles.XML](/sharepoint/dev/apis/migration-api-overview#archivedfilessxml)
 
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 ## SourceType field required
 
 Beginning April 1, 2023, the SourceType field is mandatory when calling the Migration API. Starting October 1st, 2022, a warning message will be sent if the field is missing.