Docs: Saving Data questions
I'd find it helpful if the guide answered the following questions about saving data:

* How where is the data being saved?
  * e.g. localStorage in web
  * What about standalone executables?
* Are different games getting different save disks? How are they being told apart?
  * e.g. If multiple games are published on one website, (how) are they not overwriting each other's saves?
* If there are different saves per game, is it possible to upgrade a game?
  * I've started a [Pokemon-like RPG](https://jaller94.gitlab.io/wasm4-monster-collector) and wonder if I will be able to update the game and still continue old saves. (Obviously, the game would need to handle versioning of save formats itself.)