Address feedback

docs/backfill.md

@@ -14,12 +14,11 @@ Referred medium article: [Using NPM Library in Google BigQuery UDF](https://medi
 git clone https://github.com/stellar/js-stellar-base.git
 cd js-stellar-base
 yarn
-npx webpack --config config/webpack.config.browser.js
+yarn build:prod
 ```
 
 Above will create following files in `js-stellar-base/dist/` directory:
 
-- stellar-base.js
 - stellar-base.min.js
 
 Copy above files in a GCS bucket.
@@ -29,6 +28,7 @@ Copy above files in a GCS bucket.
 Following is example to extract FeeAccountMuxed:
 
 ```
+javascript
     let tx_meta = "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";
 
     let txe = StellarBase.xdr.TransactionEnvelope.fromXDR(tx_meta, 'base64');