Update data-views.asciidoc (elastic#203854)

## Summary

Remove backticks from two code blocks.

docs/concepts/data-views.asciidoc

@@ -142,14 +142,14 @@ To match indices starting with `logstash-`, but exclude those starting with `log
 all clusters having a name starting with `cluster_`:
 
 ```ts
-`cluster_*:logstash-*,cluster_*:-logstash-old*`
+cluster_*:logstash-*,cluster_*:-logstash-old*
 ```
 
 Excluding a cluster avoids sending any network calls to that cluster.
 To exclude a cluster with the name `cluster_one`:
 
 ```ts
-`cluster_*:logstash-*,-cluster_one:*`
+cluster_*:logstash-*,-cluster_one:*
 ```
 
 Once you configure a {data-source} to use the {ccs} syntax, all searches and
@@ -182,4 +182,4 @@ for {data-sources} with a high field count that span a large number of indices a
 list is updated every couple of minutes in typical {kib} usage. Alternatively, use the refresh button on the {data-source} 
 management detail page to get an updated field list. A force reload of {kib} has the same effect. 
 
-The field list may be impacted by changes in indices and user permissions.
+The field list may be impacted by changes in indices and user permissions.