[PRA-216] Create release notes for stable release (#202)

---------

Signed-off-by: deusebio <edeusebio85@gmail.com>
Co-authored-by: Bikalpa Dhakal <bikalpa.dhakal@canonical.com>
Co-authored-by: welpaolo <paolo.sottovia@canonical.com>
Co-authored-by: Vladimir Izmalkov <48120135+izmalk@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: deusebio <10907198+deusebio@users.noreply.github.com>
Co-authored-by: Rob Gibbon <robgibbon@me.com>
Co-authored-by: Alex Batisse <alex.batisse@canonical.com>

Author: 7 people

docs/.custom_wordlist.txt

@@ -31,6 +31,7 @@ https
 Intersphinx
 io
 ip
+Jira
 Kaggle
 kaggle
 kubeconfig
@@ -80,6 +81,7 @@ texlive
 TOC
 toctree
 tolerations
+Trivy
 txt
 uncommenting
 URL

docs/reference/releases/index.md

@@ -10,10 +10,12 @@ myst:
 Charmed Apache Spark has the following stable revisions:
 
 * [2](reference-releases-revision-2)
+* [4](reference-releases-revision-4)
 
 ```{toctree}
 :titlesonly:
 :hidden:
 
 Revision 2<revision-2.md>
+Revision 4<revision-4.md>
 ```