doc: release: Remove v3.4.0 from the list of supported releases

Only the two most recent mainline releases are supported.

Signed-off-by: Maureen Helm <maureen.helm@analog.com>
diff --git a/doc/conf.py b/doc/conf.py
index ea0e8a4..a8da347 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -189,7 +189,6 @@
         ("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/"),
     ),
     "display_gh_links": True,
diff --git a/doc/releases/eol_releases.rst b/doc/releases/eol_releases.rst
index 22900a5..ab56f07 100644
--- a/doc/releases/eol_releases.rst
+++ b/doc/releases/eol_releases.rst
@@ -11,4 +11,4 @@
    release-notes-1.?
    release-notes-1.*
    release-notes-2.[0-6]
-   release-notes-3.[0-2]
+   release-notes-3.[0-4]
diff --git a/doc/releases/index.rst b/doc/releases/index.rst
index e1d2343..afcf5dc 100644
--- a/doc/releases/index.rst
+++ b/doc/releases/index.rst
@@ -62,8 +62,6 @@
 +-----------------+----------------+---------------+
 | `Zephyr 3.5.0`_ | 2023-10-20     | 2024-07-26    |
 +-----------------+----------------+---------------+
-| `Zephyr 3.4.0`_ | 2023-06-16     | 2024-02-29    |
-+-----------------+----------------+---------------+
 
 As of 2022-01-01, LTS1 (1.14.x) is not supported and has reached end of life (EOL).
 
@@ -83,7 +81,7 @@
 
    eol_releases
    release-notes-2.7
-   release-notes-3.[3-6]
+   release-notes-3.[5-6]
 
 Migration Guides
 ****************
@@ -115,6 +113,5 @@
 .. _`GitHub repository`: https://github.com/zephyrproject-rtos/zephyr
 .. _`GitHub tagged releases`: https://github.com/zephyrproject-rtos/zephyr/tags
 .. _`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/