Grammatical adjustments of advanced topic `Documents` (#9426)

docs/advanced_topics/documents/custom_document_model.md

@@ -41,15 +41,15 @@ WAGTAILDOCS_DOCUMENT_MODEL = 'app_label.CustomDocument'
 ```
 
 ```{note}
-Migrating from the builtin document model
+Migrating from the built-in document model:
 
 When changing an existing site to use a custom document model, no documents
 will be copied to the new model automatically. Copying old documents to the
 new model would need to be done manually with a
 {ref}`data migration <django:data-migrations>`.
 
-Any templates that reference the builtin document model will still continue
-to work as before.
+Templates that reference the built-in document model will continue
+to work as before
 ```
 
 ## Referring to the document model

docs/advanced_topics/documents/title_generation_on_upload.md

@@ -8,11 +8,11 @@ You can also customise this [same behaviour for images](../images/title_generati
 
 You can customise the resolved value of this title using a JavaScript [event listener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener) which will listen to the `'wagtail:documents-upload'` event.
 
-The simplest way to add JavaScript to the editor is via the [`insert_global_admin_js` hook](insert_global_admin_js), however any JavaScript that adds the event listener will work.
+The simplest way to add JavaScript to the editor is via the [`insert_global_admin_js` hook](insert_global_admin_js). However, any JavaScript that adds an event listener will work.
 
 ## DOM Event
 
-The event name to listen for is `'wagtail:documents-upload'`. It will be dispatched on the document upload `form`. The event's `detail` attribute will contain:
+The event name to listen to is `'wagtail:documents-upload'`. It will be dispatched on the document upload `form`. The event's `detail` attribute will contain:
 
 -   `data` - An object which includes the `title` to be used. It is the filename with the extension removed.
 -   `maxTitleLength` - An integer (or `null`) which is the maximum length of the `Document` model title field.
@@ -58,7 +58,7 @@ def get_global_admin_js():
 
 ### Changing generated titles on the page editor only to remove dashes/underscores
 
-Using the [`insert_editor_js` hook](insert_editor_js) instead so that this script will not run on the `Document` upload page, only on page editors.
+Use the [`insert_editor_js` hook](insert_editor_js) instead so that this script will run only on page editors and not on the `Document`.
 
 ```python
 # wagtail_hooks.py