docs: update API documentation

docs/api/src/xray_lite/lib.rs.html

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 </pre></div><pre class="rust"><code><span class="attr">#![warn(missing_docs)]
 </span><span class="comment">//#![deny(warnings)]
 </span><span class="doccomment">//! Provides a client interface for [AWS X-Ray](https://aws.amazon.com/xray/)
@@ -140,6 +149,10 @@
 //!
 //! #### Subsegment of AWS service operation
 //!
+//! **The [`xray_lite_aws_sdk`](https://docs.rs/xray-lite-aws-sdk) extension is
+//! recommended for tracing operations through
+//! [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).**
+//!
 //! Here is an example to record a subsegment of an AWS service operation
 //! within a Lambda function invocation instrumented with AWS X-Ray:
 //!
@@ -239,6 +252,11 @@
 //!     // the subsegment will be ended and reported when it is dropped
 //! }
 //! ```
+//!
+//! ### Acknowledgements
+//!
+//! This crate is based on the [great work](https://github.com/softprops/xray)
+//! by [Doug Tangren (softprops)](https://github.com/softprops).
 
 </span><span class="kw">mod </span>client;
 <span class="kw">mod </span>context;