[docs] [issue25495] binascii documentation incorrect

[Mouse]

Mouse added the comment:

Yes I know where this came from. :-)

Here is my proposed change.

Replace the statement 

The length of data should be at most 57 to adhere to the base64 standard.

with:

To be MIME-compliant, the Base64 output (as defined in RFC4648) should be broken into lines of at most 76 characters long. This post-processing of the output is the responsibility of the caller. Note that the original PEM context-transfer encoding limited line length to 64 characters.


Would this change be agreeable to you?

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