Rollup merge of rust-lang#129995 - alexcrichton:remove-wasm32-wasip2-release-notes, r=pietroalbini

Remove wasm32-wasip2's tier 2 status from release notes

It turns out the stars did not actually align for this to get released in Rust 1.81 alas. Full tier 2 status for `wasm32-wasip2` required two PRs:

* rust-lang#126967 - this made it into Rust 1.81
* rust-lang#127867 - this didn't make the cut and is in Rust 1.82 instead

This wasn't caught until just after today's release so the plan is to remove the release notes for 1.81 and coordinate to instead add these as release notes to 1.82.

Author: workingjubilee

RELEASES.md

@@ -34,7 +34,6 @@ Compiler
   - [Add Tier 3 `std` Xtensa targets:](https://github.com/rust-lang/rust/pull/126380/) `xtensa-esp32-espidf`, `xtensa-esp32s2-espidf`, `xtensa-esp32s3-espidf`
   - [Add Tier 3 i686 Redox OS target:](https://github.com/rust-lang/rust/pull/126192/) `i686-unknown-redox`
   - [Promote `arm64ec-pc-windows-msvc` to Tier 2.](https://github.com/rust-lang/rust/pull/126039/)
-  - [Promote `wasm32-wasip2` to Tier 2.](https://github.com/rust-lang/rust/pull/126967/)
   - [Promote `loongarch64-unknown-linux-musl` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/126298/)
   - [Enable full tools and profiler for LoongArch Linux targets.](https://github.com/rust-lang/rust/pull/127078/)
   - [Unconditionally warn on usage of `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/126662/) (see compatibility note below)