docs: update 5.14.0 release notes (#1409)

Author: devcorpio

CHANGELOG.asciidoc

@@ -29,6 +29,15 @@ See Conventional Commits (https://conventionalcommits.org) for commit guidelines
 [[release-notes-5.x]]
 === RUM JS Agent version 5.x
 
+[[release-notes-5.14.0]]
+==== 5.14.0 (2023-08-03)
+[float]
+===== Features
+* Add redirect span to the page-load transaction: {pull}1400[#1400]
+
+===== Bug fixes
+* Fetch API instrumentation now handles requests with `URL` objects. {pull}1398[#1398]
+
 [[release-notes-5.13.0]]
 ==== 5.13.0 (2023-07-19)
 [float]