Added undefined example (#8899)

Into section `Booleans, Null, and Undefined Are Ignored` I've added example with undefined.
8 years ago · 61877c13e0
1 changed files with 2 additions and 0 deletions
--- a/docs/jsx-in-depth.md
+++ b/docs/jsx-in-depth.md
@ -381,6 +381,8 @@ Children passed to a custom component can be anything, as long as that component

 <div>{null}</div>

+<div>{undefined}</div>
+
 <div>{true}</div>
 ```