doc/go1.24: mention wasm initial memory reduction

Change-Id: I9a25ae2eea66c35e274f55435af6bc1b8564cbc5
Reviewed-on: https://go-review.googlesource.com/c/website/+/649255
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

_content/doc/go1.24.md

@@ -825,6 +825,10 @@ These types are also permitted as argument or result types for `go:wasmexport` f
 <!-- go.dev/issue/68024 -->
 The support files for WebAssembly have been moved to `lib/wasm` from `misc/wasm`.
 
+<!-- CL 621635, CL 621636 -->
+The initial memory size is significantly reduced, especially for small WebAssembly
+applications.
+
 ### Windows {#windows}
 
 <!-- go.dev/issue/70705 -->