Fix typos & ts check

MIGRATION.md

@@ -446,7 +446,7 @@ In Storybook 8.0 we are introducing a new icon library available with `@storyboo
 
 #### React-docgen component analysis by default
 
-In Storybook 7, we used `react-docgen-typescript` to analyze React component props and auto-generated control. In Storybook 8, we have moved to `react-docgen` as the new default. `react-docgen` is dramatically more efficient, shaving seconds off of dev startup times. However, it only analyzes basic TypeScript constructs.
+In Storybook 7, we used `react-docgen-typescript` to analyze React component props and auto-generate controls. In Storybook 8, we have moved to `react-docgen` as the new default. `react-docgen` is dramatically more efficient, shaving seconds off of dev startup times. However, it only analyzes basic TypeScript constructs.
 
 We feel `react-docgen` is the right tradeoff for most React projects. However, if you need the full fidelity of `react-docgen-typescript`, you can opt-in using the following setting in `.storybook/main.js`:
 

code/lib/cli/src/automigrate/fixes/react-docgen.ts

@@ -30,15 +30,15 @@ export const reactDocgen: Fix<Options> = {
       but doesn't handle all TypeScript constructs.
 
       We can update your config to continue to use "react-docgen-typescript",
-      though we recommend giving "react-docgen" or a much faster dev experience.
+      though we recommend giving "react-docgen" for a much faster dev experience.
 
       https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#react-docgen-component-analysis-by-default
     `;
   },
 
   async run({ dryRun, mainConfigPath }) {
     if (!dryRun) {
-      await updateMainConfig({ mainConfigPath, dryRun }, async (main) => {
+      await updateMainConfig({ mainConfigPath, dryRun: !!dryRun }, async (main) => {
         logger.info(`✅ Setting typescript.reactDocgen`);
         if (!dryRun) {
           main.setFieldValue(['typescript', 'reactDocgen'], 'react-docgen-typescript');