Update creating-columns.md

Update code example and consistency

Author: BCleverly

docs/columns/creating-columns.md

@@ -8,8 +8,10 @@ The `columns` method on your component must return an array of Column objects in
 ```php
 public function columns(): array
 {
-    Column::make('Name'),
-    Column::make('Email'),
+    return [
+        Column::make('Name'),
+        Column::make('Email'),
+    ];
 }
 ```
 
@@ -20,13 +22,23 @@ By default, you only need one parameter which acts as the header of the column,
 So if you have:
 
 ```php
-Column::make('Name') // Looks for column `name`
-Column::make('Email') // Looks for column `email`
+public function columns(): array
+{
+    return [
+        Column::make('Name') // Looks for column `name`
+        Column::make('Email') // Looks for column `email`
+    ];
+}
 ```
 
 Of course, this won't work in every situation, for example if you have an ID column, Str::snake will convert it to `i_d` which is incorrect. For this situation and any other situation where you want to specify the field name, you can pass it as the second parameter:
 
 ```php
-Column::make('ID', 'id'),
-Column::make('E-mail', 'email'),
+public function columns(): array
+{
+    return [
+        Column::make('ID', 'id'),
+        Column::make('E-mail', 'email'),
+    ];
+}
 ```