Update code host connection link in documentation (#1428)

Fix code host connection link in documentation

Author: natehessler

docs/batch-changes/site-admin-configuration.mdx

@@ -2,7 +2,7 @@
 
 <p className="subtitle">Learn what configuration permissions site admins have with Batch Changes.</p>
 
-Using Batch Changes requires a [code host connection](/admin/external_services/) to a supported code host (currently GitHub, Bitbucket Server/Bitbucket Data Center, GitLab, and Bitbucket Cloud). Site admins can configure the following when setting and disabling Batch Changes:
+Using Batch Changes requires a [code host connection](/admin/code_hosts/) to a supported code host (currently GitHub, Bitbucket Server/Bitbucket Data Center, GitLab, and Bitbucket Cloud). Site admins can configure the following when setting and disabling Batch Changes:
 
 ## Set up Batch Changes