Correct program output ("Steps", not "Times")

[skierpage]

Since 985c1fe , hello-compute has output "Steps: ...", not "Times: ..."

Description
The README doesn't match the current example code's behavior.

Testing
I ran the command from the README

RUST_LOG=hello_compute cargo run --example hello-compute 1 4 3 295

and console output was

Steps: [0, 2, 7, 55]

I didn't see timestamp and INFO prepended to the output, that looks like Rust is logging to the journal or is configured differently.

I don't know if it's worth mentioning

When run in a browser, you have to enable Firefox's Web Developer Tools and enable "Logs" level output in its Console tab to see the output.

[cwfitzgerald]

Thank you! As for timing, if we don't have a timestamp query implementation for your platform yet (basically only vulkan), we won't show times.