Update article.md

Fix typo, minor grammar fix.
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@ -2,7 +2,7 @@
What if the binary data is actually a string? For instance, we received a file with textual data.
The build-in [TextDecoder](https://encoding.spec.whatwg.org/#interface-textdecoder) object allows to read the value into an actual JavaScript string, given the buffer and the encoding.
The built-in [TextDecoder](https://encoding.spec.whatwg.org/#interface-textdecoder) object allows one to read the value into an actual JavaScript string, given the buffer and the encoding.
We first need to create it:
```js