Fix typo in File Name description of FTP receiver adapter.

[aPhilRa]

If the "File Name" parameter is left BLANK then the FTP receiver adapter uses the value of the header parameter CamelFileName.
The documentation describes it as if it would work exactly the opposite way.

Typo: "isn't" <> "is"

[cla-assistant]

All committers have signed the CLA.

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[MelanieCueppers]

Hi @aPhilRa, thanks for your feedback. You will soon see the corrected help page on the SAP Help Portal.