docs: remove obsolete attributes

Author: mladedav

src/lib.rs

@@ -96,10 +96,8 @@
 //!
 //! [layer]: tracing_subscriber::layer
 #![warn(unreachable_pub)]
-#![doc(html_root_url = "https://docs.rs/tracing-opentelemetry/0.22.0")]
 #![doc(
-    html_logo_url = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png",
-    issue_tracker_base_url = "https://github.com/tokio-rs/tracing-opentelemetry/issues/"
+    html_logo_url = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"
 )]
 #![cfg_attr(
     docsrs,