Let me try to translate it, he did it by removing the pin (Sounds dangerous...), you will see there 2 bars (male joint?) on the hinge.
When you turn it over, you can see the left hinge should be symmetric to the right hinge (workers used 2 left right side hinge on both wings)
Turn it over and you will find one of the "male thing" on the hinge is longer than the other, so file/trim the "male" thing a bit to make it the same length to the left hinge.
Put it back... and it is done
Hope this explains, or please help to rephase it in better english....
Removing the pin is not easy, so I might just live with this....
P.S. I am asking for permission to put his pic here...