Fix --format example for docker history
@@ -77,17 +77,11 @@ output the data exactly as the template declares or, when using the
`table` directive, will include column headers as well.
The following example uses a template without headers and outputs the
-`ID` and `CreatedSince` entries separated by a colon for all images:
+`ID` and `CreatedSince` entries separated by a colon for the `busybox` image:
```bash
-$ docker images --format "{{.ID}}: {{.Created}} ago"
-
-cc1b61406712: 2 weeks ago
-<missing>: 2 weeks ago
-<missing>: 2 weeks ago
-<missing>: 2 weeks ago
-<missing>: 2 weeks ago
-<missing>: 3 weeks ago
-<missing>: 3 weeks ago
-<missing>: 3 weeks ago
+$ docker history --format "{{.ID}}: {{.CreatedAt}}" busybox
+
+f6e427c148a7: 4 weeks ago
+<missing>: 4 weeks ago
```
