Fixed typo in the wp_register_script function for block tutorial

[aharish]

npm run build will generate an index.js file at builds/index.js, and not a block.js.

Description

npm run build will generate an index.js file at builds/index.js. I have changed the code in wp_register_script() from block.js to a index.js.

How has this been tested?

I tested this while creating a test block while following the tutorial. I had copy pasted the code from this page, but was unable to get the block to show up in the editor. I cross checked everything, looked at the examples repo linked in the documentation where it actually has the correct file mentioned. I made the change above and was able to get the block to show up on the editor.

Testing environment:
Node Version: v12.17.0
Webpack Version: 4.43.0

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[chrisvanpatten]

This seems right to me.

[github-actions]

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