lua_api.txt: Document how to properly clear node metadata

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 4a7a3c0a0e9081e8db8f664c3ca36452a50b1a8a..5a2f370ef708934350b4b5c3f12a6f9ace1c65bf 100644 (file)
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -2641,6 +2641,7 @@ Can be gotten via `minetest.get_meta(pos)`.
 * `get_inventory()`: returns `InvRef`
 * `to_table()`: returns `nil` or `{fields = {...}, inventory = {list1 = {}, ...}}`
 * `from_table(nil or {})`
+    * to clear metadata, use from_table(nil)
     * See "Node Metadata"
 
 ### `NodeTimerRef`