Index: src/wp-admin/about.php
===================================================================
--- src/wp-admin/about.php	(revision 47431)
+++ src/wp-admin/about.php	(working copy)
@@ -179,7 +179,7 @@
 				<?php
 				printf(
 					/* translators: %s: WordPress 5.4 Field Guide link. */
-					__( 'There’s lots more for developers to love in WordPress 5.4. To discover more and learn how to make these changes shine on your on your sites, themes, plugins and more, check the <a href="%s">WordPress 5.4 Field Guide.</a>' ),
+					__( 'There’s lots more for developers to love in WordPress 5.4. To discover more and learn how to make these changes shine on your on your sites, themes, plugins and more, check the <a href="%s">WordPress 5.4 Field Guide</a>.' ),
 					'https://make.wordpress.org/core/?p=80034'
 				);
 				?>