[CDI] Rename file_integrations.md to file_storage_integrations.md

[jayhahn]

Pull Request/Issue Resolution

Description of Change:

https://www.braze.com/docs/user_guide/data_and_analytics/cloud_ingestion is linking to https://www.braze.com/docs/user_guide/data_and_analytics/cloud_ingestion/file_storage_integrations, which currently doesn't exist (404s) because it's at https://www.braze.com/docs/user_guide/data_and_analytics/cloud_ingestion/file_integrations. Having the word storage is probably good for SEO so going with renaming the file, instead of fixing the link.

This page was just added last week (and not released to customers yet) so I don't expect there to be many or any incoming links.

Closes #ISSUE_NUMBER_HERE

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

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[josh-mccrowell-braze]

@jayhahn Thanks for flagging this!