Improving the get_tile_map_data_as_array() function documentation

[IHPI]

I wanted to take the tile data from a tilemap and use it to make an image file to use as a map of sorts.
I had to go to the source code of the game to see what each value in the array was.
I think this would be an easy addition to the TileMapLayer documentation.
It would also make the set_tile_map_data_from_array(value) function more useful.

(Values below for anyone interested [or so you don't have to look up the source code in case this gets implemented])
[indexes]: function

[0,1]: versioning information
[2,3]: the X position on the map
[4,5]: the Y position on the map
[6,7]: source texture ID
[8,9]: X coordinate on the texture atlas
[10,11]: Y coordinate on the texture atlas
[12,13]: Tile variation number

(The data is stored as encode_uint16 meaning they take up 2 bytes on the list [Just stick the bits next to each other to get a number])
(Negatives are stored as 2's complement [Just write the positive number in bits, flip the bits, and add 1 to get a negative number])