getHitPosition() in PlayerInteractBlockEvent

This method will get the position the player clicked on the block, to pick out which "pixel" is clicked.
As @gratimax said, additional paragraphs should be wrapped in `<p>` and `</p>` tags.
https://docs.spongepowered.org/en/latest/devs/guidelines/

> Wrap additional paragraphs in `<p>` and `</p>`