Updated list of response codes

Added new response codes to this page:
https://docs.fiserv.dev/public/docs/response-codes

The following document was updated:
General Gateway Response Codes

List of new response codes:

Code	Description / Action / Meaning
5002	clickToPay not supported
50828	MC DataOnly incompatible with FIRST or CIT UCOF.
30575	Acquirer cannot be null

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