fix: fixed config (#1361)

Co-authored-by: Idris Olubisi <[email protected]>

Author: benjamin852

src/content/docs/validator/external-chains/xrpl.mdx

@@ -95,7 +95,7 @@ Edit your `rippled.cfg` file located under `/etc/opt/ripple/rippled.cfg`.
 
 ```
 [ips]
-r.altnet.rippletest.net 51235
+s.altnet.rippletest.net 51235
 ```
 
 2. Comment out the previous `[ips]` stanza, if there is one.