Add api documentation (#361)

you

2017-06-05 987cc5a6a425b1f9bcd9000608dc389a45c675a1

 technic/machines/LV/geothermal.lua

@@ -10,9 +10,9 @@
minetest.register_craft({
   output = 'technic:geothermal',
   recipe = {
      {'technic:granite', 'default:diamond', 'technic:granite'},
      {'technic:granite',          'default:diamond',        'technic:granite'},
      {'technic:fine_copper_wire', 'technic:machine_casing', 'technic:fine_copper_wire'},
      {'technic:granite', 'technic:lv_cable0', 'technic:granite'},
      {'technic:granite',          'technic:lv_cable',       'technic:granite'},
   }
})

@@ -82,8 +82,9 @@
   description = S("Geothermal %s Generator"):format("LV"),
   tiles = {"technic_geothermal_top.png", "technic_machine_bottom.png", "technic_geothermal_side.png",
            "technic_geothermal_side.png", "technic_geothermal_side.png", "technic_geothermal_side.png"},
   groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
      technic_machine=1, technic_lv=1},
   paramtype2 = "facedir",
   groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2, technic_machine=1},
   legacy_facedir_simple = true,
   sounds = default.node_sound_wood_defaults(),
   on_construct = function(pos)
@@ -99,7 +100,8 @@
   tiles = {"technic_geothermal_top_active.png", "technic_machine_bottom.png", "technic_geothermal_side.png",
            "technic_geothermal_side.png", "technic_geothermal_side.png", "technic_geothermal_side.png"},
   paramtype2 = "facedir",
   groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2, not_in_creative_inventory=1},
   groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
      technic_machine=1, technic_lv=1, not_in_creative_inventory=1},
   legacy_facedir_simple = true,
   sounds = default.node_sound_wood_defaults(),
   drop = "technic:geothermal",