feat: make createCssVariablesTheme no longer experimental

Author: antfu

docs/guide/regex-engines.md

@@ -38,6 +38,10 @@ const shiki = await createShiki({
 
 ## JavaScript RegExp Engine (Experimental)
 
+::: warning Experimental
+This feature is experimental and may change without following semver.
+:::
+
 This experimental engine uses JavaScript's native RegExp. As TextMate grammars' regular expressions are in Oniguruma flavor that might contains syntaxes that are not supported by JavaScript's RegExp, we use [`oniguruma-to-js`](https://github.com/antfu/oniguruma-to-js) to lowering the syntaxes and try to make them compatible with JavaScript's RegExp.
 
 ```ts {3,8}

docs/guide/theme-colors.md

@@ -90,10 +90,6 @@ This is only allowed for the `colorReplacements` option and not for the theme ob
 
 ## CSS Variables Theme
 
-::: warning Experimental
-This feature is experimental and may change without following semver.
-:::
-
 Shiki provides a factory function helper `createCssVariablesTheme` for creating a theme that uses CSS variables easier. Note that this theme is a lot less granular than most of the other themes and requires to define the CSS variables in your app. This is provided for easier migration from Shiki's [`css-variables theme`](https://github.com/shikijs/shiki/blob/main/docs/themes.md#theming-with-css-variables). For better highlighting result, we recommend construct the theme manually with [Arbitrary Color Values](#arbitrary-color-values) or use [Color Replacements](#color-replacements) to override an existing theme.
 
 This theme is **not included by default** and must be registered explicitly:

packages/shiki/src/theme-css-variables.ts

@@ -33,7 +33,6 @@ export interface CssVariablesThemeOptions {
 /**
  * A factory function to create a css-variable-based theme
  *
- * @experimental This API is experimental and may change without following semver
  * @see https://shiki.style/guide/theme-colors#css-variables-theme
  */
 export function createCssVariablesTheme(options: CssVariablesThemeOptions = {}): ThemeRegistration {