Add descriptions and examples for buildx history commands

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

docs/reference/buildx_history_rm.md

@@ -14,3 +14,28 @@ Remove build records
 
 <!---MARKER_GEN_END-->
 
+## Description
+
+Remove one or more build records from the current builder’s history. You can
+remove specific builds by name or ID, or delete all records at once using
+the `--all` flag.
+
+## Examples
+
+### Remove a specific build
+
+```console
+docker buildx history rm mybuild
+```
+
+### Remove multiple builds
+
+```console
+docker buildx history rm mybuild frontend-build backend-build
+```
+
+### Remove all build records from the current builder
+
+```console
+docker buildx history rm --all
+```