Consistent CodePen links in docs

docs/docs/conditional-rendering.md

@@ -41,7 +41,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/ZpVxNq?editors=0011)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/ZpVxNq?editors=0011)
 
 This example renders a different greeting depending on the value of `isLoggedIn` prop.
 
@@ -115,7 +115,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/QKzAgB?editors=0010)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/QKzAgB?editors=0010)
 
 While declaring a variable and using an `if` statement is a fine way to conditionally render a component, sometimes you might want to use a shorter syntax. There are a few ways to inline conditions in JSX, explained below.
 
@@ -237,4 +237,4 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/Xjoqwm?editors=0010)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/Xjoqwm?editors=0010)

docs/docs/forms.md

@@ -4,7 +4,9 @@ title: Forms
 permalink: docs/forms.html
 prev: state-and-lifecycle.html
 next: lifting-state-up.html
-redirect_from: "tips/controlled-input-null-value.html"
+redirect_from:
+  - "tips/controlled-input-null-value.html"
+  - "docs/forms-zh-CN.html"
 ---
 
 HTML form elements work a little bit differently from other DOM elements in React, because form elements naturally keep some internal state. For example, this form in plain HTML accepts a single name:

docs/docs/lists-and-keys.md

@@ -42,7 +42,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/GjPyQr?editors=0011)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/GjPyQr?editors=0011)
 
 This code displays a bullet list of numbers between 1 and 5.
 
@@ -94,7 +94,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/jrXYRR?editors=0011)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/jrXYRR?editors=0011)
 
 ## Keys
 
@@ -200,7 +200,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/rthor/pen/QKzJKG?editors=0010)
+[Try it on CodePen.](https://codepen.io/rthor/pen/QKzJKG?editors=0010)
 
 A good rule of thumb is that elements inside the `map()` call need keys.
 
@@ -244,7 +244,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/NRZYGN?editors=0010)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/NRZYGN?editors=0010)
 
 Keys serve as a hint to React but they don't get passed to your components. If you need the same value in your component, pass it explicitly as a prop with a different name:
 
@@ -294,6 +294,6 @@ function NumberList(props) {
 }
 ```
 
-[Try it out on CodePen.](https://codepen.io/gaearon/pen/BLvYrB?editors=0010)
+[Try it on CodePen.](https://codepen.io/gaearon/pen/BLvYrB?editors=0010)
 
 Sometimes this results in clearer code, but this style can also be abused. Like in JavaScript, it is up to you to decide whether it is worth extracting a variable for readability. Keep in mind that if the `map()` body is too nested, it might be a good time to [extract a component](/react/docs/components-and-props.html#extracting-components).