Remove duplicate JavaDocs - At some point upstream decided to fix some of their JD errors/warnings, so now we have duplicate tags, bringing new warnings.
Also add missing `@param` for ItemStack.deserializeBytes
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
e461dcfe #555: Item - add getters/setters for owner/thrower
CraftBukkit Changes:
055870c4 #758: Item - add getters/setters for owner/thrower
