Update conditional-rendering.md (#1175)

The ternary syntax using parenthesis was an unconventional prettier invention, going out of its way to format react ternaries differently from normal ternaries (if i remember correctly, because vim users had trouble re-formating without a mouse). If they made the right decision or not is one thing, but the additional noise could mislead beginners here, thinking they have to add more characters to make a simple 2-slot ternary, or that it is a "react thing".

content/docs/conditional-rendering.md

@@ -176,11 +176,10 @@ render() {
   const isLoggedIn = this.state.isLoggedIn;
   return (
     <div>
-      {isLoggedIn ? (
+      {isLoggedIn
-        <LogoutButton onClick={this.handleLogoutClick} />
+        ? <LogoutButton onClick={this.handleLogoutClick} />
-      ) : (
+        : <LoginButton onClick={this.handleLoginClick} />
-        <LoginButton onClick={this.handleLoginClick} />
+      }
-      )}
     </div>
   );
 }