docs: fixed typo in readme (#21154)

Author: RTISCOOL

README.md

@@ -45,7 +45,7 @@ $ npm install --save @solana/web3.js
 <!-- Development (un-minified) -->
 <script src="https://unpkg.com/@solana/web3.js@latest/lib/index.iife.js"></script>
 
-<!-- Production (un-minified) -->
+<!-- Production (minified) -->
 <script src="https://unpkg.com/@solana/web3.js@latest/lib/index.iife.min.js"></script>
 ```