Add descriptions and examples for buildx history commands

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

docs/reference/buildx_history_ls.md

@@ -17,3 +17,48 @@ List build records
 
 <!---MARKER_GEN_END-->
 
+## Description
+
+List completed builds recorded by the active builder. Each entry includes the
+build ID, name (if available), status, timestamp, and duration.
+
+By default, only records for the current builder are shown. You can filter
+results using flags.
+
+## Examples
+
+### List all build records for the current builder
+
+```console
+docker buildx history ls
+```
+
+### List only failed builds
+
+```console
+docker buildx history ls --filter status=error
+```
+
+### List builds from the current directory
+
+```console
+docker buildx history ls --local
+```
+
+### Display full output without truncation
+
+```console
+docker buildx history ls --no-trunc
+```
+
+### Format output as JSON
+
+```console
+docker buildx history ls --format json
+```
+
+### Use a Go template to print name and durations
+
+```console
+docker buildx history ls --format '{{.Name}} - {{.Duration}}'
+```