[5.0.x] Added stub release notes and release date for 5.0.11 and 4.2.18.

Backport of 53e21eebf22bc05c7fa30820b453b7f345b7af40 from main.

docs/releases/4.2.18.txt

@@ -0,0 +1,7 @@
+===========================
+Django 4.2.18 release notes
+===========================
+
+*January 14, 2025*
+
+Django 4.2.18 fixes a security issue with severity "moderate" in 4.2.17.

docs/releases/5.0.11.txt

@@ -0,0 +1,7 @@
+===========================
+Django 5.0.11 release notes
+===========================
+
+*January 14, 2025*
+
+Django 5.0.11 fixes a security issue with severity "moderate" in 5.0.10.

docs/releases/index.txt

@@ -25,6 +25,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   5.0.11
    5.0.10
    5.0.9
    5.0.8
@@ -43,6 +44,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   4.2.18
    4.2.17
    4.2.16
    4.2.15