[5.0.x] Added stub release notes for 5.0.2.

Backport of f412add786dfc18424eee6281ec8cc97220b04fc from main

docs/releases/5.0.2.txt

@@ -0,0 +1,12 @@
+==========================
+Django 5.0.2 release notes
+==========================
+
+*Expected February 5, 2024*
+
+Django 5.0.2 fixes several bugs in 5.0.1.
+
+Bugfixes
+========
+
+* ...

docs/releases/index.txt

@@ -25,6 +25,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   5.0.2
    5.0.1
    5.0