Retroactively add missing stabilized APIs to relnotes

Author: theemathas

RELEASES.md

@@ -78,6 +78,7 @@ Stabilized APIs
 - [`FusedIterator for StepBy<I>`](https://doc.rust-lang.org/stable/std/iter/struct.StepBy.html#impl-FusedIterator-for-StepBy%3CI%3E)
 - [`std::fs::set_times`](https://doc.rust-lang.org/stable/std/fs/fn.set_times.html)
 - [`std::fs::set_times_nofollow`](https://doc.rust-lang.org/stable/std/fs/fn.set_times_nofollow.html)
+- [`<LocalKey<Cell<T>>>::update`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.update)
 
 <a id="1.99.0-Cargo"></a>
 
@@ -207,6 +208,13 @@ Stabilized APIs
 - [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html)
 - [`bool::ok_or`](https://doc.rust-lang.org/stable/std/primitive.bool.html#method.ok_or)
 - [`bool::ok_or_else`](https://doc.rust-lang.org/stable/std/primitive.bool.html#method.ok_or_else)
+- [`Option::map_or_default`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.map_or_default)
+- [`Result::map_or_default`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.map_or_default)
+- [`Box::as_ptr`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.as_ptr)
+- [`Box::as_mut_ptr`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.as_mut_ptr)
+- [`Path::is_empty`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_empty)
+- [`PathBuf::into_string`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.into_string)
+- [`arch::{arm,aarch64}::vdot*`: NEON dot product intrinsics](https://github.com/rust-lang/rust/issues/117224)
 
 
 <a id="1.98.0-Compatibility-Notes"></a>
@@ -530,6 +538,7 @@ Stabilized APIs
 - [`Layout::repeat`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat)
 - [`Layout::repeat_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat_packed)
 - [`Layout::extend_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.extend_packed)
+- [`core::arch::aarch64::__jcvt`](https://doc.rust-lang.org/stable/core/arch/aarch64/fn.__jcvt.html)
 
 These previously stable APIs are now stable in const contexts: