[DOC] Add other attributes to trace structure doc (#4106)

(cherry picked from commit 0172f4d)

docs/sources/tempo/traceql/trace-structure.md

@@ -33,15 +33,20 @@ The first four properties are *intrinsics*.
 They are fundamental to the span.
 
 *Attributes* are custom span metadata in the form of key-value pairs.
-There are two types of attributes: **span attributes** and **resource attributes**.
+There are four types of attributes: span attributes, resource attributes, event attributes, and link attributes.
 
 *Span attributes* are key-value pairs that contain metadata that you can use to annotate a span to carry information about the operation it's tracking.
 For example, in an eCommerce application, if a span tracks an operation that adds an item to a user’s shopping cart, the user ID, added item ID and cart ID can be captured and attached to the span as span attributes.
 
-A *Resource attribute* represents information about an entity producing the span.
+A *resource attribute* represents information about an entity producing the span.
 For example, a span created by a process running in a container deployed by Kubernetes could link a resource that specifies the cluster name, namespace, pod, and container name.
 Resource attributes are resource-related metadata (key-value pairs) that are describing the Resource.
 
+An *event attribute* represents a unique point in the time during the span's duration. For more information, refer to [All about span events](https://grafana.com/blog/2024/08/15/all-about-span-events-what-they-are-and-how-to-query-them/#how-to-query-span-events-with-traceql) and [Span events](https://opentelemetry.io/docs/concepts/signals/traces/#span-events) in the OTEL documentation.
+
+A *link attribute* lets you query link data in a span.
+A span link associates one span with one or more other spans that are a casual relationship. For more information on span links, refer to the [Span Links](https://opentelemetry.io/docs/concepts/signals/traces/#span-links) documentation in the Open Telemetry project.
+
 The OpenTelemetry specification defines Semantic Attributes for Spans and for Resources.
 Semantic Span Attributes are a set of naming schemes for attributes shared across languages, frameworks, and runtimes.
 For more details, refer to [Trace Semantic Conventions](https://opentelemetry.io/docs/specs/semconv/general/trace/) and [Resource Semantic Conventions](https://opentelemetry.io/docs/specs/semconv/resource/).