document new parameter

Author: hx2A

py5_docs/Reference/api_en/Py5Shape_get_vertex_count.txt

@@ -8,10 +8,16 @@ processing_name = getVertexCount
 
 @@ signatures
 get_vertex_count() -> int
+get_vertex_count(include_children: bool, /) -> int
+
+@@ variables
+include_children: bool - include vertices in the shape's children
 
 @@ description
 The `get_vertex_count()` method returns the number of vertices that make up a `Py5Shape`. In the example, the value 4 is returned by the `get_vertex_count()` method because 4 vertices are defined in `setup()`.
 
+Use the `include_children` parameter to include the shape's children if the shape happens to be a `GROUP` shape. By default, a shape's children will not be included in the count.
+
 @@ example
 def setup():
     global s