Discrepancy in naming of network pickles

[iffy-ifyy]

Describe the bug
I noticed a little discrepancy. In the "getting started" portion of things, the network pickles created are saved as "config.NETWORK_Y_PICKLES", but when we go to use them in the "calculate statistical enrichment" portion of things, they are called "config.NETWORK_Y_PICKLE". The lack of S causes the code to return a file not found error, for me at least.

When I add the S, the error disappears