Docs do not explain what a tracy span is

[ctsrc]

https://docs.rs/tracy-client/latest/tracy_client/macro.span.html

It is not clear from the rust tracy client docs what a "Tracy span" is.

If we take a look in Tracy itself, they only mention the word "span" four times in their own documentation pdf.

Things that are not clear:

• Is a Tracy span related to tokio tracing (crate tracing) span?

• Are Tracy spans used together with Tracy frames? Or are Tracy spans and Tracy frames orthogonal to one-another?

• When running Tracy connected to rust tracy client, where in Tracy can you see the beginnings, ends and durations of the spans you define using the rust tracy client?