Add descriptions and examples for buildx history commands

Signed-off-by: sarahsanders-docker <sarah.sanders@docker.com>

docs/reference/buildx_history_trace.md

@@ -15,3 +15,36 @@ Show the OpenTelemetry trace of a build record
 
 <!---MARKER_GEN_END-->
 
+## Description
+
+View the OpenTelemetry trace for a completed build. This command loads the
+trace into a Jaeger UI running in a local container
+(or a custom instance if configured) and opens it in your browser.
+
+This helps analyze build performance, step timing, and internal execution flows.
+
+## Examples
+
+### Open the OpenTelemetry trace for the most recent build
+
+```console
+docker buildx history trace
+```
+
+### Open the trace for a specific build
+
+```console
+docker buildx history trace mybuild
+```
+
+### Run the Jaeger UI on a specific port
+
+```console
+docker buildx history trace mybuild --addr 127.0.0.1:16686
+```
+
+### Compare two build traces
+
+```console
+docker buildx history trace --compare mybuild:main mybuild:feature
+```