Snap in capacitor footprint
As others already commented, snap-in is to temporarily fixate the capacitor on the PCB.
TDK states about snap-in:


  The snap-in aluminum electrolytic capacitors feature two pin or three pin snap- in terminals making them perfect for easy mounting on the PCB of the application.
  (source)


And 


  Snap-in solder pins to hold component in place on PC-board 
  (source)  


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I think this drawing from Würth Elektronik shows how a snap-in capacitor just fits and therefore "snaps" in and how the capilary solder joint should look like.
Note the leads are not (further) bent.