Fix: Remove unneeded else branches from documentation examples

docs/conditional-rendering.md

@@ -30,9 +30,8 @@ function Greeting(props) {
   const isLoggedIn = props.isLoggedIn;
   if (isLoggedIn) {
     return <UserGreeting />;
-  } else {
-    return <GuestGreeting />;
   }
+  return <GuestGreeting />;
 }
 
 ReactDOM.render(

docs/introducing-jsx.md

@@ -60,9 +60,8 @@ This means that you can use JSX inside of `if` statements and `for` loops, assig
 function getGreeting(user) {
   if (user) {
     return <h1>Hello, {formatName(user)}!</h1>;
-  } else {
-    return <h1>Hello, Stranger.</h1>;
   }
+  return <h1>Hello, Stranger.</h1>;
 }
 ```
 

docs/lifting-state-up.md

@@ -16,9 +16,8 @@ We will start with a component called `BoilingVerdict`. It accepts the `celsius`
 function BoilingVerdict(props) {
   if (props.celsius >= 100) {
     return <p>The water would boil.</p>;
-  } else {
-    return <p>The water would not boil.</p>;
   }
+  return <p>The water would not boil.</p>;
 }
 ```