docs: update frame doc

Author: warmist

docs/dev/Lua API.rst

@@ -6570,15 +6570,14 @@ Functions
   Frames are synchronized with the machines this building is connected to.
 
   :workshop_type:   custom workshop string id, e.g. ``SOAPMAKER`` or numeric id
-  :frames:          table of frames. Each frame is sparse flat table with ids from ``0`` to ``31*31-1``.
-                    Each frame tile is table of integers from 4 to 8 members long. Tile members are as
-                    follow: ``tile``, ``foreground color``, ``background color``, ``bright``,
-                    ``graphics tile``, ``overlay tile``, ``signpost tile``, ``item tile``.
+  :frames:          table of frames. Each frame is array of rows of tiles with ids from ``1`` to ``31``.
+                    Each frame tile is table of with following optional members: ``ch``, ``fg``,
+                    ``bg``, ``bold``, ``tile``, ``tile_overlay``, ``tile_signpost``, ``tile_item``.
                     First 4 are function same as ascii workshop definition. The latter 4 are graphics
-                    layers. ``signpost tile`` is an optional row that sticks up over the workshop.
+                    layers. ``tile_signpost `` is only valid in first row and it shows up above the workshop.
 
-  :frame_skip:      How many ticks to display one frame. If set to negative number (or skipped) frames
-                    are synchronized with machine animation.
+  :frame_skip:      How many ticks to display one frame. If set to negative number, zero or skipped frames
+                    are synchronized with other connected machines animations.
 
 * ``setAnimationInfoAuto(workshop_type, make_graphics_too[, frame_length][, gear_tiles])``
 

plugins/building-hacks.cpp

@@ -462,13 +462,12 @@ static void loadFrames(lua_State* L,workshop_hack_data& def,int stack_pos)
             }
             lua_pop(L, 1); //pop current row
         }
-        
         def.frames.push_back(frame);
         frame_index++;
         lua_pop(L, 1); //pop current frame
     }
 
-    return ;
+    return;
 }
 
 //fixImpassible(workshop_type) - changes how impassible tiles work with liquids.