What is LDO Ishutdown?
This can be one of 2 things. 

I would think when looking at Ishutdown, it would be the max current before shutting down. However, if you look at your figures, you can see that the 'I' values are extremely low, so this seems very unlikely.

The second thing it could be is how  much current it consumes when it is in 'shutdown' This seems far more likely due to the low values.

After a quick google search for Ishutdown, I came across this datasheet. Looking at the Electical Characteristics section, we see this part:


To me, this confirms that it is my second option that is correct. The output current limit is pretty self explanatory and if you look at the conditions for the Ishutdown, you can see it says Ven = &lt;0.4V. 

As the EN pin needs the pin driven high to enable the device, this shows us that Ishutdown must mean the current drawn from the device when in shutdown mode.