message: Simplify triangle example's vertex input state
diff: @@ -263,13 +263,9 @@ fn main() {
  },
  ];
  - let vertex_input_state_info = vk::PipelineVertexInputStateCreateInfo {
  - vertex_attribute_description_count: vertex_input_attribute_descriptions.len() as u32,
  - p_vertex_attribute_descriptions: vertex_input_attribute_descriptions.as_ptr(),
  - vertex_binding_description_count: vertex_input_binding_descriptions.len() as u32,
  - p_vertex_binding_descriptions: vertex_input_binding_descriptions.as_ptr(),
  - ..Default::default()
  - };
  + let vertex_input_state_info = vk::PipelineVertexInputStateCreateInfo::builder()
  + .vertex_attribute_descriptions(&vertex_input_attribute_descriptions)
  + .vertex_binding_descriptions(&vertex_input_binding_descriptions);
  let vertex_input_assembly_state_info = vk::PipelineInputAssemblyStateCreateInfo {
  topology: vk::PrimitiveTopology::TRIANGLE_LIST,
  ..Default::default()
  