A bunch of minor doc and tutorial fixes.

docs/en/manuals/camera.md

@@ -92,8 +92,6 @@ function init(self)
     -- Track current position and where someone told us to look at.
 	self.pos = go.get_world_position()
 	self.look_at = self.pos
-    -- Store measured speed
-	self.speed = 0
 end
 
 function update(self, dt)

docs/en/manuals/spine.md

@@ -21,7 +21,7 @@ Currently, Defold does not support animation keys that flip bones over the X or
 : This data file contains the skeleton, all the image slot names, skins and the actual animation data. No images are embedded in this file though. Create this file from your animation software of choice.
 
 *Spine scene*
-: The Defold resource tying together the Spine JSON data file and the image atlas that is used to fill bone slots with graphics.
+: The Defold resource tying together the Spine JSON data file and the Defold image atlas file that is used to fill bone slots with graphics.
 
 *Spine model*
 : The _SpineModel_ component is put in a game object to bring the graphics and animation to the screen. The component contains the skeleton game object hierarchy, which animation to play, what skin to use and it also specifies the material used for rendering the model. See [SpineModel documentation](/manuals/spinemodel) for details.

docs/en/tutorials/magic-link.md

@@ -294,7 +294,7 @@ function on_input(self, action_id, action)
     if action_id == hash("touch") and action.value == 1 then
         -- What block was touched or dragged over?
         local x = math.floor((action.x - edge) / blocksize)
-        local y = math.floor((action.y - edge) / blocksize)
+        local y = math.floor((action.y - bottom_edge) / blocksize)
 
         if x < 0 or x >= boardwidth or y < 0 or y >= boardheight or self.board[x][y] == nil then
             -- outside board.
@@ -469,7 +469,7 @@ local function remove_chain(self)
 end
 ```
 
-We'll also need a function to actually remove (set to `nil`) the positions on the board that has been set to `hash("removed")`:
+We'll also need a function to actually remove (set to `nil`) the positions on the board that has been set to `hash("removing")`:
 
 ```lua
 -- board.script