Update release_notes/48-release-notes.adoc

Co-authored-by: Kerry Carmichael <[email protected]>

Author: erthalion

release_notes/48-release-notes.adoc

@@ -57,7 +57,7 @@ data it has collected.
 When preparing the upgrade to {product-title-short} 4.8, follow these
 suggestions:
 
-* Back up the database before upgrading to {product-title-short} 4.8
+* Back up the database before upgrading to {product-title-short} 4.8.
 
 * If you are not upgrading by using the Operator, check the disk space
   available for the database by viewing the