fix ws2812 doc

components/modules/ws2812.c

@@ -36,6 +36,9 @@ static int ws2812_write( lua_State* L )
   int top = lua_gettop( L );
 
   for (int stack = 1; stack <= top; stack++) {
+    if (lua_type( L, stack ) == LUA_TNIL)
+      continue;
+
     if (lua_type( L, stack ) != LUA_TTABLE) {
       ws2812_cleanup( L, 0 );
       luaL_checktype( L, stack, LUA_TTABLE ); // trigger error

docs/en/modules/ws2812.md

@@ -7,15 +7,13 @@ ws2812 is a library to handle ws2812-like led strips.
 It works at least on WS2812, WS2812b, APA104, SK6812 (RGB or RGBW).
 
 ## ws2812.write()
-Send data to one or two led strip using its native format which is generally Green,Red,Blue for RGB strips
-and Green,Red,Blue,White for RGBW strips.
+Send data to up to 8 led strip using its native format which is generally Green,Red,Blue for RGB strips and Green,Red,Blue,White for RGBW strips.
 
 #### Syntax
-`ws2812.write(array)`
+`ws2812.write(table, ...)`
 
 #### Parameters
-Array containing an element for each chain (maximum of 8 elements):
-
+Variable number of tables, each describing a single strip. Required elements are:
 - `pin` 0 ~ 33, I/O index
 - `data` payload to be sent to one or more WS2812 like leds through GPIO2