As noted in the issue there are a few clarifications needed in the "Base85 Encodings" section of the base64 module documentation. Namely:

• Base85 is not a de facto standard, but three actual standards, including one actual April Fool's joke (really!)
• The behaviour of adobe=True was not fully specified, particularly that it raises ValueError on unterminated input
• The behaviour of pad=True was not correctly described - the input is always padded, the question is whether this padding is retained in the output encoding.

Also note that pad=True is required by the ZeroMQ standard, but perhaps ZeroMQ is tolerant of Z85 encoded data that isn't a multiple of 5 bytes.

• Issue: Clarify base64.a85(en,de)code documentation for Adobe mode #134837

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