fix(nextjs): fix typo (#6029)

Author: imattferreira

src/platforms/javascript/guides/nextjs/manual-setup.mdx

@@ -377,7 +377,7 @@ For data fetching methods, use the following functions:
 
 _(New in version 7.20.0)_
 
-If you want auto-instrumenatation to apply by default, but want to exclude certain routes, use the `excludeServerRoutes` option in the `sentry` object in your `next.config.js`:
+If you want auto-instrumentation to apply by default, but want to exclude certain routes, use the `excludeServerRoutes` option in the `sentry` object in your `next.config.js`:
 
 ```javascript {filename:next.config.js}
 const moduleExports = {