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Add missing paramtype2 documentation (#9397)

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doc/lua_api.txt
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@ -948,7 +948,8 @@ Node paramtypes
The functions of `param1` and `param2` are determined by certain fields in the
node definition.
`param1` is reserved for the engine when `paramtype != "none"`:
The function of `param1` is determined by `paramtype` in node definition.
`param1` is reserved for the engine when `paramtype != "none"`.
* `paramtype = "light"`
* The value stores light with and without sun in its upper and lower 4 bits
@ -965,19 +966,27 @@ node definition.
* mesh
* plantlike
* plantlike_rooted
* `paramtype = "none"`
* `param1` will not be used by the engine and can be used to store
an arbitrary value
`param2` is reserved for the engine when any of these are used:
The function of `param2` is determined by `paramtype2` in node definition.
`param2` is reserved for the engine when `paramtype2 != "none"`.
* `liquidtype = "flowing"`
* The level and some flags of the liquid is stored in `param2`
* `drawtype = "flowingliquid"`
* The drawn liquid level is read from `param2`
* `drawtype = "torchlike"`
* `drawtype = "signlike"`
* `paramtype2 = "flowingliquid"`
* Used by `drawtype = "flowingliquid"` and `liquidtype = "flowing"`
* The liquid level and a flag of the liquid are stored in `param2`
* Bits 0-2: Liquid level (0-7). The higher, the more liquid is in this node
* Bit 3: If set, liquid is flowing downwards (no graphical effect)
* `paramtype2 = "wallmounted"`
* The rotation of the node is stored in `param2`. You can make this value
by using `minetest.dir_to_wallmounted()`.
* Supported drawtypes: "torchlike", "signlike", "normal", "nodebox", "mesh"
* The rotation of the node is stored in `param2`
* You can make this value by using `minetest.dir_to_wallmounted()`
* Values range 0 - 5
* The value denotes at which direction the node is "mounted":
0 = y+, 1 = y-, 2 = x+, 3 = x-, 4 = z+, 5 = z-
* `paramtype2 = "facedir"`
* Supported drawtypes: "normal", "nodebox", "mesh"
* The rotation of the node is stored in `param2`. Furnaces and chests are
rotated this way. Can be made by using `minetest.dir_to_facedir()`.
* Values range 0 - 23
@ -996,13 +1005,13 @@ node definition.
* The height of the 'plantlike' section is stored in `param2`.
* The height is (`param2` / 16) nodes.
* `paramtype2 = "degrotate"`
* Only valid for "plantlike". The rotation of the node is stored in
* Only valid for "plantlike" drawtype. The rotation of the node is stored in
`param2`.
* Values range 0 - 179. The value stored in `param2` is multiplied by two to
get the actual rotation in degrees of the node.
* `paramtype2 = "meshoptions"`
* Only valid for "plantlike". The value of `param2` becomes a bitfield which
can be used to change how the client draws plantlike nodes.
* Only valid for "plantlike" drawtype. The value of `param2` becomes a
bitfield which can be used to change how the client draws plantlike nodes.
* Bits 0, 1 and 2 form a mesh selector.
Currently the following meshes are choosable:
* 0 = a "x" shaped plant (ordinary plant)
@ -1034,6 +1043,9 @@ node definition.
* `param2` values 0-63 define 64 levels of internal liquid, 0 being empty
and 63 being full.
* Liquid texture is defined using `special_tiles = {"modname_tilename.png"}`
* `paramtype2 = "none"`
* `param2` will not be used by the engine and can be used to store
an arbitrary value
Nodes can also contain extra data. See [Node Metadata].