add note on the batch logic

spikes/list/react-infinite/readme.md

@@ -4,3 +4,4 @@
  - it's keeping the location when we filter (kinda)
  - tried with 100000 rows and it scrolled flawlessly, but it struggled filtering (I assume that the filter itself it the reason)
  - because the calculations are based on a fixed container height, we might need to figure out how to handle a responsive ui where the height changes
+ - I notice that instead of recycling rows progressively, it does it in batches