Add docs for the new unicode-sets-regex plugins

docs/plugin-proposal-unicode-sets-regex.md

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+---
+id: babel-plugin-proposal-unicode-sets-regex
+title: @babel/plugin-proposal-unicode-sets-regex
+sidebar_label: unicode-sets-regex
+---
+
+This plugins transform regular expression using the `v` flag, introduced by the [RegExp set notation + properties of strings](https://github.com/tc39/proposal-regexp-set-notation) proposal, to regular expressions that use the `u` flag.
+
+## Example
+
+```js
+/[\p{ASCII}&&\p{Decimal_Number}]/v
+```
+
+will be transformed to
+
+```js
+/[0-9]/u
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-proposal-unicode-sets-regex
+```
+
+## Usage
+
+### With a configuration file (Recommended)
+
+```json
+{
+  "plugins": ["@babel/plugin-proposal-unicode-sets-regex"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-proposal-unicode-sets-regex script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transformSync("code", {
+  plugins: ["@babel/plugin-proposal-unicode-sets-regex"],
+});
+```

docs/plugin-syntax-unicode-sets-regex.md

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+---
+id: babel-plugin-syntax-unicode-sets-regex
+title: @babel/plugin-syntax-unicode-sets-regex
+sidebar_label: unicode-sets-regex
+---
+
+> #### Syntax only
+>
+> It's unlikely you want to use this plugin directly as it only enables Babel to parse this syntax. Instead, use [plugin-proposal-unicode-sets-regex](plugin-proposal-unicode-sets-regex.md) to _both_ parse and transform this syntax.
+
+This plugins enabled parsing regular expression using the `v` flag, introduced by the [RegExp set notation + properties of strings](https://github.com/tc39/proposal-regexp-set-notation) proposal, to regular expressions that use the `u` flag.
+
+## Example
+
+```js
+/[\p{ASCII}&&\p{Decimal_Number}]/v
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-syntax-unicode-sets-regex
+```
+
+## Usage
+
+### With a configuration file (Recommended)
+
+```json
+{
+  "plugins": ["@babel/plugin-syntax-unicode-sets-regex"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-syntax-unicode-sets-regex script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transformSync("code", {
+  plugins: ["@babel/plugin-syntax-unicode-sets-regex"],
+});
+```