Fix documented return type for to_big_endian_64
@@ -34,7 +34,7 @@ Binary Functions
Decodes binary data from the hex encoded ``string``.
-.. function:: to_big_endian_64(bigint) -> binary
+.. function:: to_big_endian_64(bigint) -> varbinary
Encodes ``bigint`` in a 64-bit 2's complement big endian format.
