Minor grammar fixes to 4.2 release notes

docs/releases/4.2.md

@@ -168,12 +168,12 @@ Thank you to all who provided feedback, participants to our usability testing se
 
 The `AbstractImage` and `AbstractRendition` models use a Wagtail-specific `WagtailImageField` which extends Django's `ImageField`
 to use [Willow](https://github.com/wagtail/Willow/) for image file handling. This will generate a new migration if you
-are using a [custom image model](custom_image_model)
+are using a [custom image model](custom_image_model).
 
 ### Comments within `InlinePanel` not supported
 
-When the commenting system was introduced, support for `InlinePanel` fields was incorrectly added. This has lead to issues
-where comments can be lost on save or in most cases will be added to the incorrect item within the `InlinePanel`. The ability
+When the commenting system was introduced, support for `InlinePanel` fields was incorrectly added. This has led to issues
+where comments can be lost on save, or in most cases will be added to the incorrect item within the `InlinePanel`. The ability
 to add comments here has now been removed and as such any existing comments that were added will no longer show.
 
 See https://github.com/wagtail/wagtail/issues/9685 for tracking of adding this back officially in the future.