doc: release: Add v3.6.0 to the list of supported releases

Adds v3.6.0 to the list of supported releases. The EOL date corresponds
to the expected release date for v4.0.0.

Signed-off-by: Maureen Helm <maureen.helm@analog.com>
diff --git a/doc/conf.py b/doc/conf.py
index a570eef..ea0e8a4 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -187,6 +187,7 @@
     "current_version": version,
     "versions": (
         ("latest", "/"),
+        ("3.6.0", "/3.6.0/"),
         ("3.5.0", "/3.5.0/"),
         ("3.4.0", "/3.4.0/"),
         ("2.7.5 (LTS)", "/2.7.5/"),
diff --git a/doc/releases/index.rst b/doc/releases/index.rst
index fb00f05..e1d2343 100644
--- a/doc/releases/index.rst
+++ b/doc/releases/index.rst
@@ -58,6 +58,8 @@
 +=================+================+===============+
 | `Zephyr 2.7.5`_ | 2023-06-01     | 2024-08-31    |
 +-----------------+----------------+---------------+
+| `Zephyr 3.6.0`_ | 2024-02-23     | 2024-11-29    |
++-----------------+----------------+---------------+
 | `Zephyr 3.5.0`_ | 2023-10-20     | 2024-07-26    |
 +-----------------+----------------+---------------+
 | `Zephyr 3.4.0`_ | 2023-06-16     | 2024-02-29    |
@@ -115,3 +117,4 @@
 .. _`Zephyr 2.7.5`: https://docs.zephyrproject.org/2.7.5/
 .. _`Zephyr 3.4.0`: https://docs.zephyrproject.org/3.4.0/
 .. _`Zephyr 3.5.0`: https://docs.zephyrproject.org/3.5.0/
+.. _`Zephyr 3.6.0`: https://docs.zephyrproject.org/3.6.0/