Fix require path in Babel recipe

Author: LukasHechenberger

docs/recipes/babel.md

@@ -190,15 +190,15 @@ require('@babel/register')({
 });
 ```
 
-Now instead of requiring `@babel/register`, require `test/_register` instead.
+Now instead of requiring `@babel/register`, require `./test/_register` instead.
 
 **`package.json`:**
 
 ```json
 {
 	"ava": {
 		"require": [
-			"test/_register.js"
+			"./test/_register.js"
 		]
 	}
 }