Update root docs

Author: blackbeam

README.md

@@ -81,6 +81,7 @@ as well as `native-tls`-based TLS support.
     mysql_async = { version = "*", default-features = false, features = ["rustls-tls"] }
 
 *   `tracing` – enables instrumentation via `tracing` package.
+
     Primary operations (`query`, `prepare`, `exec`) are instrumented at `INFO` level.
     Remaining operations, incl. `get_conn`, are instrumented at `DEBUG` level.
     Also at `DEBUG`, the SQL queries and parameters are added to the `query`, `prepare`
@@ -110,6 +111,10 @@ SSL support comes in two flavors:
     -   it, most likely, won't work on windows, at least with default server certs,
         generated by the MySql installer.
 
+## Connection URL parameters
+
+There is a set of url-parameters supported by the driver (see documentation on [`Opts`]).
+
 ## Example
 
 ```rust

src/lib.rs

@@ -79,6 +79,20 @@
 //!     [dependencies]
 //!     mysql_async = { version = "*", default-features = false, features = ["rustls-tls"] }
 //!
+//! *   `tracing` – enables instrumentation via `tracing` package.
+//!
+//!     Primary operations (`query`, `prepare`, `exec`) are instrumented at `INFO` level.
+//!     Remaining operations, incl. `get_conn`, are instrumented at `DEBUG` level.
+//!     Also at `DEBUG`, the SQL queries and parameters are added to the `query`, `prepare`
+//!     and `exec` spans.
+//!
+//!     **Example:**
+//!
+//!     ```toml
+//!     [dependencies]
+//!     mysql_async = { version = "*", features = ["tracing"] }
+//!     ```
+//!
 //! [myslqcommonfeatures]: https://github.com/blackbeam/rust_mysql_common#crate-features
 //!
 //! # TLS/SSL Support
@@ -96,6 +110,10 @@
 //!     -   it, most likely, won't work on windows, at least with default server certs,
 //!         generated by the MySql installer.
 //!
+//! # Connection URL parameters
+//!
+//! There is a set of url-parameters supported by the driver (see documentation on [`Opts`]).
+//!
 //! # Example
 //!
 //! ```rust