tracing

82a92dfd - fix: correct SerializeField definition and doc formatting (#3040)

fix: correct SerializeField definition and doc formatting (#3040) Clippy in 1.80.0 alerted us to the fact that `SerializeField` was never constructed (and due to its non-`pub` member, it can't be constructed outside the `tracing-serde` crate where it's from). This change fixes the definition to hold a reference to a `Field`, which is what the other `Serialize*` types do. It also implements `AsSerde` for this type and uses it inside the `SerializeFieldSet` type. As a bonus, Clippy is now also happy that the type is constructed. The example collector in the `tracing-serde` crate was also renamed from `JsonSubscriber` to `JsonCollector`. Some additional doc formatting issues in `tracing-subscriber` were fixed so that list items that run to multiple lines are correctly indented.