Update content/recipes/nest-commander.md

Author: kamilmysliwiec

content/recipes/nest-commander.md

@@ -12,7 +12,7 @@ Just like any other package, you've got to install it before you can use it.
 $ npm i nest-commander
 ```
 
-#### A Command File
+#### A Command file
 
 `nest-commander` makes it easy to write new command-line applications with [decorators](https://www.typescriptlang.org/docs/handbook/decorators.html) via the `@Command()` decorator for classes and the `@Option()` decorator for methods of that class. Every command file should implement the `CommandRunner` interface and should be decorated with a `@Command()` decorator.