chore(sidecar): trim FFI doc comment

Author: Leiyks

datadog-sidecar-ffi/src/lib.rs

@@ -755,12 +755,9 @@ pub unsafe extern "C" fn ddog_sidecar_session_set_process_tags(
     MaybeError::None
 }
 
-/// Records the source of the default service name for the session so the
-/// sidecar can inject svc.user:true or svc.auto:<default_service_name> into
-/// outgoing process tag payloads. Pass an empty `default_service_name` to
-/// signal the user explicitly set DD_SERVICE; pass a non-empty value (already
-/// normalized via `ddog_normalize_process_tag_value`) to signal the tracer
-/// auto-resolved that name.
+/// Records the default service name for the session. Empty = user-defined
+/// (sidecar emits `svc.user:true`); non-empty = auto-resolved with that name
+/// (sidecar emits `svc.auto:<name>`).
 #[no_mangle]
 #[allow(clippy::missing_safety_doc)]
 pub unsafe extern "C" fn ddog_sidecar_session_set_default_service_name(