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Fix typos (#4500)

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- Fixed a typo
- Fixed the title of the freecodecamp link
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src/data/roadmaps/nodejs/content/104-nodejs-async-programming/102-promises.md
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# Promises
A promise is commonly defined as a proxy for a value that will eventually become available
A promise is commonly defined as a proxy for a value that will eventually become available.
Asynchronous functions use promise behind the scenes, so understanding how promises work is fundamental to understanding how "async" and "await" works.
Once a promise has been called, it will start in a pending state. This means that the calling function continues executing, while the promise is pending until it resolves, giving the calling function whatever data was being requested.
@ -13,5 +13,5 @@ Visit the following resources to learn more:
- [Promise Methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
- [Official Website](https://www.promisejs.org/)
- [Official Website](https://www.freecodecamp.org/news/javascript-promises-for-beginners/)
- [JavaScript Promises for Beginners](https://www.freecodecamp.org/news/javascript-promises-for-beginners/)
- [Asynchronous JavaScript - Promises](https://www.youtube.com/watch?v=a_8nrslImo4/)