Fix configuration names secret_path vs secret_file

[schildbach]

It's the other way round: Synapse requires secret_path, MAS requires secret_file.

(I think it should be changed to secret_file for both, because it's a file not a directory or tree.)

[CLAassistant]

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[schildbach]

I won't sign CLAs.

[sandhose]

Hey, thanks for this contribution!

I won't sign CLAs.

We cannot accept contributions without the CLA being signed. There are more details in this blog post on why this is, and to quote one specific part that is I think relevant:

to be clear, the sole reason for a CLA is to allow Element to dual-license the software as per https://gnu.org/philosophy/selling-exceptions.html - not to give Element the ability to relicense to a non-OSI license in future. After all, Element already had that ability with the Apache license, and has not used it.