Fix link to babel setup doc from webpack doc (#5355)

Author: NTARelix

docs/Webpack.md

@@ -42,7 +42,7 @@ module.exports = {
 ```
 
 If you have JavaScript files that are transformed by Babel, you can
-[enable support for Babel](GettingStarted.md#using-babel-with-jest) by
+[enable support for Babel](GettingStarted.md#using-babel) by
 installing the `babel-jest` plugin. Non-Babel JavaScript transformations can be
 handled with Jest's
 [`transform`](Configuration.md#transform-object-string-string) config option.