Merge pull request #15856 from marcbachmann/patch-1

Document index deletion using comma separated indices

docs/reference/indices/delete-index.asciidoc

@@ -11,9 +11,8 @@ $ curl -XDELETE 'http://localhost:9200/twitter/'
 The above example deletes an index called `twitter`. Specifying an index,
 alias or wildcard expression is required.
 
-The delete index API can also be applied to more than one index, or on
-all indices (be careful!) by using `_all` or `*` as index.
+The delete index API can also be applied to more than one index, by either using a comma separated list, or on all indices (be careful!) by using `_all` or `*` as index.
 
 In order to disable allowing to delete indices via wildcards or `_all`,
 set `action.destructive_requires_name` setting in the config to `true`.
-This setting can also be changed via the cluster update settings api.
+This setting can also be changed via the cluster update settings api.