[Lang] Fix gui docstring

[neozhaoliang]

Close: #6999

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[taichi-gardener]

/rebase

[ailzhang]

LGTM!

[YouJiacheng]

According to the shader

taichi/python/taichi/shaders/Circles_vk.vert

Lines 8 to 29 in 3305acc

	layout(binding = 0) uniform UBO {
	vec3 color;
	int use_per_vertex_color;
	float radius;
	}
	ubo;
	layout(location = 1) out vec3 selected_color;
	void main() {
	gl_PointSize = ubo.radius * 2;
	float x = in_position.x * 2.0 - 1.0;
	float y = -(in_position.y * 2.0 - 1.0);
	gl_Position = vec4(x, y, 0.0, 1.0);
	if (ubo.use_per_vertex_color == 0) {
	selected_color = ubo.color;
	} else {
	selected_color = in_color.rgb;
	}

I don't think that GGUI supports array/field radius.

[neozhaoliang]

@YouJiacheng Thanks for pointing out this. The GUI.circles does support passing a numpy array for the radius, but GGUI.circles doesn't. This is will be fixed in another PR #7065