Fix typo in config path example

Author: SergeAstapov

tests/dummy/app/templates/docs/fastboot-configuration.md

@@ -3,7 +3,7 @@
 When using this addon a new FastBoot instance will be created specifically for the testing environment. The options provided to the instance can be customized through a config file.
 
 ```js
-// my-app/config/fastboot-tesitng.js
+// my-app/config/fastboot-testing.js
 
 module.exports = () => {
   return {
@@ -19,4 +19,4 @@ module.exports = () => {
 };
 ```
 
-If no configuration file is present, then FastBoot testing will use sane defaults that make sense when testing FastBoot applications. For most applications not providing a customized configuration file is the best approach.
+If no configuration file is present, then FastBoot testing will use sane defaults that make sense when testing FastBoot applications. For most applications not providing a customized configuration file is the best approach.