chore(iast): update xss release note (#12228)

An update in the XSS release note

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: avara1986

releasenotes/notes/iast-feat-xss-django-6781a8b9a4092832.yaml

@@ -1,6 +1,6 @@
 ---
 features:
   - |
-    Code Security (IAST): XSS detection for Django applications, 
+    Code Security (IAST): XSS detection for Django applications and Jinja2 (Flask and FastAPI applications), 
     which will be displayed on your DataDog Vulnerability Explorer dashboard.
     See the `Application Vulnerability Management <https://docs.datadoghq.com/security/application_security/vulnerability_management/>`_ documentation for more information about this feature.