fix typos

doc/notifications-structure-android.md

@@ -1,13 +1,13 @@
 # Android notification structure
 
-The current structure of the notification payload on android does not allow for customization on the client side. When a `notification` object is present the only customization possible is the notification icon and the primary color.
+The current structure of the notification payload on android does not allow for customisation on the client side. When a `notification` object is present the only customisation possible is the notification icon and the primary color.
 
 ## Proposed solution
 
 1. Add the data from the `notification` object to the `data` object.
 2. Remove the `notification` object.
 
-The names of the fields in the `notification` object could be the same in the `data` object. This way the client has to manually handle their notifications, which gives it the liberty to customize the design.
+The names of the fields in the `notification` object could be the same in the `data` object. This way the client has to manually handle their notifications, which gives it the liberty to customise the design.
 
 This solution would also be more extensible than the previous solution as it allows for custom fields (i.e. user avatars etc).