docs: mention Box as base32768 compatible

As suddenly many people move to Box - another "unlimited" cloud story migration saga there are frequent questions about crypt files encoding to be used.

Box is base32768 friendly.

It has been tested with:

https://pub.rclone.org/base32768.zip

and:

rclone test info --check-length boxremote:

maxFileLength = 255 // for 1 byte unicode characters
maxFileLength = 255 // for 2 byte unicode characters
maxFileLength = 255 // for 3 byte unicode characters
maxFileLength = -1 // for 4 byte unicode characters
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