[CMSP-766] Add known issue to WPMS search-replace (#8785)

* Add known issue to WPMS search-replace

* Update source/content/guides/multisite/06-search-replace.md

* Add CMS Platform to CODEOWNERS file for Multisite guide

---------

Co-authored-by: Rachel Whitton <rachel@pantheon.io>

CODEOWNERS

@@ -9,3 +9,5 @@ source/content/guides/domains/ @pantheon-systems/platform-edge-routing
 source/content/guides/filesystem/ @pantheon-systems/filesystem
 # The lifecycle-ops team is responsible for Integrated Composer
 source/content/guides/integrated-composer/ @pantheon-systems/lifecycle-ops
+# The cms-platform team is responsible for WordPress Multisite
+source/content/guides/multisite/ @pantheon-systems/cms-platform

source/content/guides/multisite/06-search-replace.md

@@ -175,6 +175,8 @@ Sites configured for subdomain conversion will _only_ run the conversion step fr
 
 * WordPress Multisites that are using the WordPress (Composer Managed) upstream are currently unable to use Multisite Search and Replace. For those sites, we recommend setting the `search_replace` value to `false` and using WP-CLI via Terminus to perform the Search and Replace. See [Run WP-CLI `search-replace` Manually](/guides/multisite/workflows/#run-wp-cli-search-replace-manually) for more information.
 
+* When using the default Subdirectory search and replace, creating a new multidev with database and files pulled from the live environment will only search and replace the platform domain, i.e. `live-{site}.pantheonsite.io`. To search and replace the correct domain on your live site, immediately follow multidev creation with a database clone either through the dashboard or with Terminus, and select the correct domain as the "from" URL. We are working on handling this seamlessly in the future.
+
 ## More Resources
 
 - [Pantheon YAML Configuration Files](/pantheon-yml)