[PATCH] doc: no longer support end of life CentOS versions

[Stephen Hemminger <stephen@networkplumber.org>]

The CentOS Project has shifted focus from CentOS Linux to CentOS Stream.
Both CentOS 7 and 8 are now end of life (EOL).

	CentOS Linux 7 EOL: 2024-06-30
	CentOS Linux 8 EOL: 2021-12-31
	CentOS Stream 8 EOL: 2024-05-31

Update the documentation and release notes. There is no explicit
test in the build process that would block these older versions
but any bug reports or problems will rejected as invalid.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 doc/guides/linux_gsg/sys_reqs.rst      | 5 +++--
 doc/guides/rel_notes/release_24_07.rst | 6 ++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst
index 9c5282573e..b8c3472cfc 100644
--- a/doc/guides/linux_gsg/sys_reqs.rst
+++ b/doc/guides/linux_gsg/sys_reqs.rst
@@ -53,7 +53,7 @@ Compilation of the DPDK
 *   ``pyelftools`` (version 0.22+)
 
     * For Fedora systems it can be installed using ``dnf install python-pyelftools``
-    * For RHEL/CentOS systems it can be installed using ``pip3 install pyelftools``
+    * For RHEL systems it can be installed using ``pip3 install pyelftools``
     * For Ubuntu/Debian it can be installed using ``apt install python3-pyelftools``
     * For Alpine Linux, ``apk add py3-elftools``
 
@@ -110,7 +110,8 @@ System Software
 
     The kernel version required is based on the oldest long term stable kernel available
     at kernel.org when the DPDK version is in development.
-    Compatibility for recent distribution kernels will be kept, notably RHEL/CentOS 7.
+    Compatibility is maintained for currently supported enterprise distribution kernels
+    such as RHEL 8 (which uses 4.18 kernel).
 
     The kernel version in use can be checked using the command::
 
diff --git a/doc/guides/rel_notes/release_24_07.rst b/doc/guides/rel_notes/release_24_07.rst
index eb2ed1a55f..096d25463b 100644
--- a/doc/guides/rel_notes/release_24_07.rst
+++ b/doc/guides/rel_notes/release_24_07.rst
@@ -209,6 +209,12 @@ Removed Items
   The DMA for HIP09 is no longer available,
   so the support is removed from hisilicon driver for HIP09 platform.
 
+* **Removed support guarantee for CentOS 7 and 8.**
+
+  DPDK can no longer guarantee support for older CentOS releases.
+  CentOS Linux 7 reached end of life (EOL) on 30 June 2024.
+  CentOS Linux 8 stream was end of life on 31 May 2024.
+
 
 API Changes
 -----------
-- 
2.43.0