[docs] Add a diagram for TX object dependencies

[huitseeker]

A followup to #557, where we noted the explanation of TXes depending on objects output by other TXes could be explained by a diagram.

This example may help:

graph TB;
    A((3))-->|Some label|B((9))
    A-->C((20))
    C-->D((15))
    C-->|another label|E((7))

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Originally posted by @huitseeker in #557 (comment)

[Clay-Mysten]

Hi Francois and Xun,

Please see the diagrams Evan has kindly provided to see if we might include them in the programming with objects tutorial or elsewhere:
https://app.golinks.io/sui-storage

Thanks!

[Clay-Mysten]

@huitseeker should we work this in to the section beginning with:
"Transactions (and thus, certificates) take objects as input..."

[randall-Mysten]

Closing this issue. Will open a new issue if this comes up again