Merge branch 'master' of https://github.com/reactjs/reactjs.org into sync-5dca78b7

Author: reactjs-translation-bot

content/community/conferences.md

@@ -52,6 +52,11 @@ September 26-28, 2019 in Alicante, Spain
 
 [Website](http://reactalicante.es/) - [Twitter](https://twitter.com/reactalicante) - [Facebook](https://www.facebook.com/ReactAlicante)
 
+### React Conf 2019 {#react-conf-2019}
+October 24-25, 2019 in Henderson, Nevada USA
+
+[Website](https://conf.reactjs.org/) - [Twitter](https://twitter.com/reactjs)
+
 ### React Advanced 2019 {#react-advanced-2019}
 October 25, 2019 in London, UK
 

content/docs/hooks-faq.md

@@ -567,7 +567,7 @@ Depending on your use case, there are a few more options described below.
 
 Let's see why this matters.
 
-If you specify a [list of dependencies](/docs/hooks-reference.html#conditionally-firing-an-effect) as the last argument to `useEffect`, `useMemo`, `useCallback`, or `useImperativeHandle`, it must include all values used inside that participate in the React data flow. That includes props, state, and anything derived from them.  
+If you specify a [list of dependencies](/docs/hooks-reference.html#conditionally-firing-an-effect) as the last argument to `useEffect`, `useMemo`, `useCallback`, or `useImperativeHandle`, it must include all values used inside that participate in the React data flow. That includes props, state, and anything derived from them.
 
 It is **only** safe to omit a function from the dependency list if nothing in it (or the functions called by it) references props, state, or values derived from them. This example has a bug:
 
@@ -618,7 +618,7 @@ This also allows you to handle out-of-order responses with a local variable insi
       const json = await response.json();
       if (!ignore) setProduct(json);
     }
-    
+
     fetchProduct();
     return () => { ignore = true };
   }, [productId]);
@@ -677,7 +677,7 @@ function Counter() {
 
 The empty set of dependencies, `[]`, means that the effect will only run once when the component mounts, and not on every re-render. The problem is that inside the `setInterval` callback, the value of `count` does not change, because we've created a closure with the value of `count` set to `0` as it was when the effect callback ran. Every second, this callback then calls `setCount(0 + 1)`, so the count never goes above 1.
 
-Specifying `[count]` as a list of dependencies would fix the bug, but would cause the interval to be reset on every change. Effectively, each `setInterval` would get one chance to execute before being cleared (similar to a `setTimout`.) That may not be desirable. To fix this, we can use the [functional update form of `setState`](/docs/hooks-reference.html#functional-updates). It lets us specify *how* the state needs to change without referencing the *current* state:
+Specifying `[count]` as a list of dependencies would fix the bug, but would cause the interval to be reset on every change. Effectively, each `setInterval` would get one chance to execute before being cleared (similar to a `setTimeout`.) That may not be desirable. To fix this, we can use the [functional update form of `setState`](/docs/hooks-reference.html#functional-updates). It lets us specify *how* the state needs to change without referencing the *current* state:
 
 ```js{6,9}
 function Counter() {