Edit info about states of promises

Author: vejol

src/content/2/en/part2c.md

@@ -279,10 +279,12 @@ The documentation on Mozilla's site states the following about promises:
 
 In other words, a promise is an object that represents an asynchronous operation. A promise can have three distinct states:
 
-- The promise is <i>pending</i>: It means that the final value (one of the following two) is not available yet.
-- The promise is <i>fulfilled</i>: It means that the operation has been completed and the final value is available, which generally is a successful operation. This state is sometimes also called <i>resolved</i>.
+- The promise is <i>pending</i>: It means that the asynchronous operation corresponding to the promise has not yet finnished and the final value is not available yet.
+- The promise is <i>fulfilled</i>: It means that the operation has been completed and the final value is available, which generally is a successful operation.
 - The promise is <i>rejected</i>: It means that an error prevented the final value from being determined, which generally represents a failed operation.
 
+There are many details related to promises, but understanding these three states is sufficient for us for now. If you want, you can read more about promises in [Mozilla's documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
+
 The first promise in our example is <i>fulfilled</i>, representing a successful _axios.get('http://localhost:3001/notes')_ request. The second one, however, is <i>rejected</i>, and the console tells us the reason. It looks like we were trying to make an HTTP GET request to a non-existent address.
 
 If, and when, we want to access the result of the operation represented by the promise, we must register an event handler to the promise. This is achieved using the method <em>then</em>:

src/content/2/fi/osa2c.md

@@ -282,9 +282,11 @@ Mozillan dokumentaatio kertoo promisesta seuraavaa:
 Promise siis edustaa asynkronista operaatiota. Promise voi olla kolmessa eri tilassa:
 
 - Aluksi promise on <i>pending</i>, eli promisea vastaava asynkroninen operaatio ei ole vielä tapahtunut.
-- Jos operaatio päättyy onnistuneesti, promise menee tilaan <i>fulfilled</i>, josta joskus käytetään myös nimitystä <i>resolved</i>.
+- Jos operaatio päättyy onnistuneesti, promise menee tilaan <i>fulfilled</i>.
 - Kolmas mahdollinen tila on <i>rejected</i>, ja se edustaa epäonnistunutta operaatiota.
 
+Promiseihin liittyy paljon yksityiskohtia, mutta näiden kolmen tilan ymmärtäminen riittää meille toistaiseksi hyvin. Voit halutessasi lukea promiseista tarkemmin [Mozillan dokumentaatiosta](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
+
 Esimerkkimme ensimmäinen promise on <i>fulfilled</i>, eli vastaa onnistunutta <em>axios.get('http://localhost:3001/notes')</em> pyyntöä. Promiseista toinen taas on <i>rejected</i>. Syy selviää konsolista, eli yritimme tehdä HTTP GET ‑pyyntöä osoitteeseen, jota ei ole olemassa.
 
 Jos ja kun haluamme tietoon promisea vastaavan operaation tuloksen, tulee promiselle rekisteröidä tapahtumankuuntelija. Tämä tapahtuu metodilla <em>then</em>: