Merge pull request #9790 from lmaze/8884-fix-addon-docs-ie11

Addon-docs: Restore IE11 compat on Windows by transpiling correctly acorn-jsx for this OS (#8884)

addons/docs/src/frameworks/common/preset.ts

@@ -1,5 +1,5 @@
-/* eslint-disable import/no-extraneous-dependencies */
 import createCompiler from '@storybook/addon-docs/mdx-compiler-plugin';
+import path from 'path';
 import remarkSlug from 'remark-slug';
 import remarkExternalLinks from 'remark-external-links';
 
@@ -52,7 +52,7 @@ export function webpack(webpackConfig: any = {}, options: any = {}) {
         ...(module.rules || []),
         {
           test: /\.js$/,
-          include: /node_modules\/acorn-jsx/,
+          include: new RegExp(`node_modules\\${path.sep}acorn-jsx`),
           use: [
             {
               loader: 'babel-loader',