Doc fixes for sc-telemetry & API struct rename (#7934)

* Doc fixes for sc-telemetry

* Fix flag to disable log reloading

* Forgot to reverse the conditions

* Apply suggestion

* Rename pattern to directives

* Rename GlobalLoggerBuilder to LoggerBuilder

* Return instead of expect

* Use transparent outside the enum

* Update client/tracing/src/logging/directives.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/service/src/task_manager/mod.rs

@@ -233,7 +233,7 @@ pub struct TaskManager {
 	/// terminates and gracefully shutdown. Also ends the parent `future()` if a child's essential
 	/// task fails.
 	children: Vec<TaskManager>,
-	/// A telemetry handle used to enter the telemetry span when a task is spawned.
+	/// A `TelemetrySpan` used to enter the telemetry span when a task is spawned.
 	telemetry_span: Option<TelemetrySpan>,
 }