update examples

examples/blinky-blocking.rs

examples/capture1.rs

examples/capture2.rs

examples/capture3.rs

examples/capture4.rs

examples/hello-world.rs

examples/hello.rs

examples/spi1.rs

examples/spi2.rs

examples/wait1.rs

examples/wait2.rs

examples/wait3.rs

examples/wait4.rs

examples/ws2812.rs

src/lib.rs