Add feature documentation to lib.rs docs

wgpu-core/src/lib.rs

@@ -13,6 +13,9 @@
 //!   [https://renderdoc.org/](https://renderdoc.org/)
 //! - **`strict_asserts`** --- Apply run-time checks, even in release builds. These are in addition
 //!   to the validation carried out at public APIs in all builds.
+//! - **`serde`** --- Enables serde functionality on common wgpu types.
+//! - **`serialize`** ---Enables serialize functionality on common wgpu types.
+//! - **`deserialize`** --- Enables deserialize functionality on common wgpu types.
 //! - **`trace`** --- Enable API tracing.
 //! - **`replay`** --- Enable API replaying
 //! - **`serial-pass`** --- Enable serializable compute/render passes, and bundle encoders.

wgpu/src/lib.rs

@@ -37,6 +37,9 @@
 //! - **`strict_asserts`** --- Apply run-time checks, even in release builds. These are in addition
 //!   to the validation carried out at public APIs in all builds.
 //! - **`api_log_info`** --- Log all API entry points at info instead of trace level.
+//! - **`serde`** --- Enables serde functionality on common wgpu types.
+//! - **`serialize`** ---Enables serialize functionality on common wgpu types.
+//! - **`deserialize`** --- Enables deserialize functionality on common wgpu types.
 //! - **`trace`** --- Allow writing of trace capture files. See [`Adapter::request_device`].
 //! - **`replay`** --- Allow deserializing of trace capture files that were written with the `trace`
 //!   feature. To replay a trace file use the [wgpu