Merge branch 'pl-doc-let-it-be-aliases' into 'master'

Mention `let_it_be` aliases in the testing guide docs

See merge request gitlab-org/gitlab!44144

doc/development/testing_guide/best_practices.md

@@ -484,17 +484,22 @@ This will result in only one `Project`, `User`, and `ProjectMember` created for
 is handled automatically using a transaction rollback.
 
 Note that if you modify an object defined inside a `let_it_be` block,
-then you will need to reload the object as needed, or specify the `reload`
-option to reload for every example.
+then you must do one of the following:
+
+- Reload the object as needed.
+- Use the `let_it_be_with_reload` alias.
+- Specify the `reload` option to reload for every example.
 
 ```ruby
+let_it_be_with_reload(:project) { create(:project) }
 let_it_be(:project, reload: true) { create(:project) }
 ```
 
-You can also specify the `refind` option as well to completely load a
-new object.
+You can also use the `let_it_be_with_refind` alias, or specify the `refind`
+option as well to completely load a new object.
 
 ```ruby
+let_it_be_with_refind(:project) { create(:project) }
 let_it_be(:project, refind: true) { create(:project) }
 ```