Apply suggestions from code review

Co-authored-by: Alexander Ebert <ebert@woltlab.com>

Author: BurntimeX

docs/tutorial/series/part_1.md

@@ -198,7 +198,7 @@ The fourth level menu item `wcf.acp.menu.link.person.add` will only be shown as
 
 ### People List
 
-To list the people in the ACP, we need the classes `PersonListPage` and `PersonGridView` and a `personList` template.
+To list the people in the ACP, we need the classes `PersonListPage`, `PersonGridView`, and a `personList` template.
 
 #### `PersonListPage`
 
@@ -226,7 +226,7 @@ To list the people in the ACP, we need the classes `PersonListPage` and `PersonG
 The following features are defined in the grid view:
 
 1. The columns to be displayed and their order.
-1. Which columns can be sorted and what the default sorting is.
+1. Which columns can be sorted and what their default sorting is.
 1. What interaction options the user has with the displayed items.
 
 #### `personList.tpl`

docs/tutorial/series/part_2.md

@@ -119,7 +119,7 @@ The language item `wcf.person.birthday` used in the label is the only new one fo
 
 ## Adding Birthday Table Column in ACP
 
-To add a birthday column to the person list page in the ACP, we need to listener to the `PersonGridViewInitialized` event and add the additional column:
+To add a birthday column to the person list page in the ACP, we need to listen to the `PersonGridViewInitialized` event and add the additional column:
 
 {jinja{ codebox(
   title="files/lib/bootstrap/com.woltlab.wcf.people.birthday.php",

docs/tutorial/series/part_3.md

@@ -149,7 +149,7 @@ With this option, comments on individual people can be disabled.
 The `PersonPage` class is similar to the `PersonEditForm` in the ACP in that it reads the id of the requested person from the request data and validates the id in `readParameters()`.
 The rest of the code only handles fetching the list of comments on the requested person.
 In `readData()`, this list is fetched using a `CommentsView` if comments are enabled for the person.
-The `assignVariables()` method assigns this view as a template variables.
+The `assignVariables()` method assigns this view as a template variable.
 
 ### `person.tpl`