Prepare for 12.0.0-beta.12 release (#7907)

Author: cknitt

CHANGELOG.md

@@ -10,33 +10,27 @@
 > - :nail_care: [Polish]
 > - :house: [Internal]
 
-# 12.0.0-beta.12 (Unreleased)
+# 12.0.0-beta.12
 
 #### :boom: Breaking Change
 
 - Make experimental-features kebap-case in compiler config like the other fields. https://github.com/rescript-lang/rescript/pull/7891
 
-#### :eyeglasses: Spec Compliance
-
 #### :rocket: New Feature
 
 - Add `littleEndian` feature for `DataView` to Stdlib. https://github.com/rescript-lang/rescript/pull/7881
-- Add `mapOkAsync`, `mapErrorAsync`, `flatMapOkAsync` and `flatMapErrorAsync` for async `result`'s to Stdlib. https://github.com/rescript-lang/rescript/pull/7906
+- Add `mapOkAsync`, `mapErrorAsync`, `flatMapOkAsync` and `flatMapErrorAsync` for async `result`s to Stdlib. https://github.com/rescript-lang/rescript/pull/7906
 
 #### :bug: Bug fix
 
 - Include `-runtime-path` as bsc argument when generating `.mlmap` file. https://github.com/rescript-lang/rescript/pull/7888
 
-#### :memo: Documentation
-
 #### :nail_care: Polish
 
 - Add (dev-)dependencies to build schema. https://github.com/rescript-lang/rescript/pull/7892
 - Dedicated error for dict literal spreads. https://github.com/rescript-lang/rescript/pull/7901
 - Dedicated error message for when mixing up `:` and `=` in various positions. https://github.com/rescript-lang/rescript/pull/7900
 
-#### :house: Internal
-
 # 12.0.0-beta.11
 
 #### :boom: Breaking Change