Replace references to third party domain with example.org (#63154).

Removes references to a third party domain outside of the WordPress project's control with the reserved domain example.org. For the inline documentation a translator note is added alerting the polyglots to use either a reserved domain or a wordpress.org domain/sub-domain.

Co-authored-by: ramonjd <[email protected]>

docs/how-to-guides/metabox.md

@@ -243,7 +243,7 @@ When the meta box area is saving, we display an updating overlay, to prevent use
 
 An example save url would look like:
 
-`mysite.com/wp-admin/post.php?post=1&action=edit&meta-box-loader=1`
+`example.org/wp-admin/post.php?post=1&action=edit&meta-box-loader=1`
 
 This url is automatically passed into React via a `_wpMetaBoxUrl` global variable.
 

packages/editor/src/components/page-attributes/parent.js

@@ -249,9 +249,12 @@ export function ParentRow() {
 							onClose={ onClose }
 						/>
 						<div>
-							{ __(
-								"Child pages inherit characteristics from their parent, such as URL structure. For instance, if 'Web Design' is a child of 'Services,' its URL would be mysite.com/services/web-design."
-							) }
+							{
+								/* translators: The domain name should be a reserved domain name to prevent linking to third party sites outside the WordPress project's control. You may also wish to use wordpress.org or a wordpress.org sub-domain. */
+								__(
+									"Child pages inherit characteristics from their parent, such as URL structure. For instance, if 'Web Design' is a child of 'Services', its URL would be example.org/services/web-design."
+								)
+							}
 							<p>
 								{ __(
 									'They also show up as sub-items in the default navigation menu. '