docs/devel/style: Mention alloca() family API is forbidden

Suggested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20250901132626.28639-4-philmd@linaro.org>

docs/devel/style.rst

diff --git a/docs/devel/style.rst b/docs/devel/style.rst
index d025933..941fe14 100644
--- a/docs/devel/style.rst
+++ b/docs/devel/style.rst
@@ -446,8 +446,8 @@
 ===========================
 
 Use of the ``malloc/free/realloc/calloc/valloc/memalign/posix_memalign``
-APIs is not allowed in the QEMU codebase. Instead of these routines,
-use the GLib memory allocation routines
+or ``alloca/g_alloca/g_newa/g_newa0`` APIs is not allowed in the QEMU codebase.
+Instead of these routines, use the GLib memory allocation routines
 ``g_malloc/g_malloc0/g_new/g_new0/g_realloc/g_free``
 or QEMU's ``qemu_memalign/qemu_blockalign/qemu_vfree`` APIs.