doc/next: document the minimum Linux kernel version for 1.24

The minimum Linux kernel version for Go 1.24 is now set to 3.2.

Updates #67001
For #68545

Change-Id: I509f09c8ed7f3067af14066cf139008db0cb06ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/622015
Auto-Submit: Carlos Amedee <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: cagedmantis

doc/next/7-ports.md

@@ -1,5 +1,10 @@
 ## Ports {#ports}
 
+### Linux {#linux}
+
+As [announced](go1.23#linux) in the Go 1.23 release notes, Go 1.24 requires Linux
+kernel version 3.2 or later.
+
 ### WebAssembly {#wasm}
 
 The support files for WebAssembly have been moved to `lib/wasm` from `misc/wasm`.