Remove extra newline at the end of an HS descriptor
In rend_encode_v2_descriptors, an extra newline is added at the end of the descriptor. However, rend-spec.txt doesn't specify this extra newline.
atagar mentionned on IRC that it would be surprising if that is the intended behaviour since other type of descriptors don't have it:
< atagar> It's the only descriptor type with it, so I'd be surprised if it was intended. ;)
Thus this should be fixed in the tor code and not in the spec.
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