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Improve documentation for liquid_alternative_* (#12810)

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doc/lua_api.txt
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@ -1189,12 +1189,14 @@ Look for examples in `games/devtest` or `games/minetest_game`.
* The cubic source node for a liquid.
* Faces bordering to the same node are never rendered.
* Connects to node specified in `liquid_alternative_flowing`.
* You *must* set `liquid_alternative_source` to the node's own name.
* Use `backface_culling = false` for the tiles you want to make
visible when inside the node.
* `flowingliquid`
* The flowing version of a liquid, appears with various heights and slopes.
* Faces bordering to the same node are never rendered.
* Connects to node specified in `liquid_alternative_source`.
* You *must* set `liquid_alternative_flowing` to the node's own name.
* Node textures are defined with `special_tiles` where the first tile
is for the top and bottom faces and the second tile is for the side
faces.
@ -8233,14 +8235,31 @@ Used by `minetest.register_node`.
-- around it until `liquid_range` is reached;
-- will drain out without a source;
-- recommended drawtype: "flowingliquid".
-- If it's "source" or "flowing" and `liquid_range > 0`, then
-- both `liquid_alternative_*` fields must be specified
-- If it's "source" or "flowing", then the
-- `liquid_alternative_*` fields _must_ be specified
liquid_alternative_flowing = "",
-- Node that represents the flowing version of the liquid
liquid_alternative_source = "",
-- Node that represents the source version of the liquid
-- These fields may contain node names that represent the
-- flowing version (`liquid_alternative_flowing`) and
-- source version (`liquid_alternative_source`) of a liquid.
--
-- Specifically, these fields are required if any of these is true:
-- * `liquidtype ~= "none" or
-- * `drawtype == "liquid" or
-- * `drawtype == "flowingliquid"
--
-- Liquids consist of up to two nodes: source and flowing.
--
-- There are two ways to define a liquid:
-- 1) Source node and flowing node. This requires both fields to be
-- specified for both nodes.
-- 2) Standalone source node (cannot flow). `liquid_alternative_source`
-- must be specified and `liquid_range` must be set to 0.
--
-- Example:
-- liquid_alternative_flowing = "example:water_flowing",
-- liquid_alternative_source = "example:water_source",
liquid_viscosity = 0,
-- Controls speed at which the liquid spreads/flows (max. 7).