doc/mruby3.2.md: update [ci skip]
- Anonymous arguments `*`, `**`, `&` can be passed for forwarding.
- Multi-precision integer is available now via `mruby-bigint` gem.
+# mruby VM and bytecode
+
+- `OP_ARYDUP` was renamed to `OP_ARYSPLAT`. The instruction name
+ was changed but instruction number and basic behavior have not
+ changed (except that `ARYDUP nil` makes `[]`).
+
# Tools
## `mruby`
- Add `Class#subclasses` method.
- Add `Module#undefined_instance_methods` method.
+## mruby-set
+
+New bundled gem.
+
# CVEs
Following CVEs are fixed.
