Update reindex.asciidoc

Fix missing quotes on Elastic documentation example, please review the other elastic version documentation.

Author: antrodrob

docs/reference/docs/reindex.asciidoc

@@ -1041,7 +1041,7 @@ ignored, only the host and port are used. For example:
 
 [source,yaml]
 --------------------------------------------------
-reindex.remote.whitelist: [otherhost:9200, another:9200, 127.0.10.*:9200, localhost:*"]
+reindex.remote.whitelist: ["otherhost:9200", "another:9200", "127.0.10.*:9200", "localhost:*"]
 --------------------------------------------------
 
 The list of allowed hosts must be configured on any nodes that will coordinate the reindex.