Mark formatting improvements in changelog

changelog_unreleased/javascript/10085.md

@@ -1,4 +1,4 @@
-#### Improve visual separation between header and body in classes with multiline headers (#10085 by @sosukesuzuki)
+#### [IMPROVEMENT:2] Improve visual separation between header and body in classes with multiline headers (#10085 by @sosukesuzuki)
 
 <!-- prettier-ignore -->
 ```ts

changelog_unreleased/javascript/10106.md

@@ -1,4 +1,4 @@
-#### Concise formatting of number-only arrays (#10106, #10160 by @thorn0)
+#### [IMPROVEMENT:3] Concise formatting of number-only arrays (#10106, #10160 by @thorn0)
 
 While in general, Prettier avoids this kind of formatting because it's not diff-friendly, in this special case we decided that the benefits outweigh the risks.
 

changelog_unreleased/javascript/10187.md

@@ -1,4 +1,4 @@
-#### Consistent indentations for conditional operators (#10187, #10266 by @sosukesuzuki)
+#### [IMPROVEMENT:6] Consistent indentation for conditional operators (#10187, #10266 by @sosukesuzuki)
 
 <!-- prettier-ignore -->
 ```ts

changelog_unreleased/javascript/10238.md

@@ -1,4 +1,4 @@
-#### Improve formatting for React Hooks call (#10238 by @sosukesuzuki)
+#### [IMPROVEMENT:1] Improve formatting for React Hooks calls (#10238 by @sosukesuzuki)
 
 <!-- prettier-ignore -->
 ```js

changelog_unreleased/javascript/10342.md

@@ -1,4 +1,4 @@
-#### Improve formatting for nested await expressions in heads of member and call expressions (#10342 by @thorn0)
+#### [IMPROVEMENT:4] Improve formatting for nested await expressions in heads of member and call expressions (#10342 by @thorn0)
 
 Even though Prettier tries to be helpful here, please don't write code like this. Have mercy upon your teammates and use intermediate variables.
 

changelog_unreleased/javascript/10693.md

@@ -1,4 +1,6 @@
-#### Improve formatting for `do` expressions (#10693 by @sosukesuzuki)
+#### [IMPROVEMENT:5] Improve formatting for `do` expressions in function calls (#10693 by @sosukesuzuki)
+
+“`do` expressions” are a [stage 1 ECMAScript proposal](https://github.com/tc39/proposal-do-expressions).
 
 <!-- prettier-ignore -->
 ```js

changelog_unreleased/javascript/9992.md

@@ -1,4 +1,4 @@
-#### Refine formatting of curried arrow functions (#9992, #10543 by @sosukesuzuki & @thorn0)
+#### [IMPROVEMENT:0] Refine formatting of curried arrow functions (#9992, #10543 by @sosukesuzuki & @thorn0)
 
 <!-- prettier-ignore -->
 ```js