Fixes notification terminology to match UI (#53808)

Co-authored-by: Jules Porter <[email protected]>

data/reusables/notifications-v2/notifications-inbox-required-setting.md

@@ -1 +1 @@
-To use the notifications inbox on {% data variables.product.prodname_dotcom %} and {% data variables.product.prodname_mobile %}, you must enable web and mobile notifications in your notification settings.
+To use the notifications inbox on {% data variables.product.prodname_dotcom %} and {% data variables.product.prodname_mobile %}, you must enable notifications for both **Email** and **On {% data variables.product.github %}** in your notification settings.

data/reusables/notifications/shared_state.md

@@ -1,2 +1,2 @@
 > [!TIP]
-> If you receive both web and email notifications, you can automatically sync the read or unread status of the notification so that web notifications are automatically marked as read once you've read the corresponding email notification. To enable this sync, your email client must be able to view images from {% ifversion fpt or ghec %}`[email protected]`{% else %}the `no-reply` email address {% ifversion ghes %}for {% data variables.location.product_location %}, which your site administrator configures{% endif %}{% endif %}.
+> If you receive notifications both via email and on {% data variables.product.github %}, you can automatically sync the read or unread status of the notification so that notifications on {% data variables.product.github %} are automatically marked as read once you've read the corresponding email notification. To enable this sync, your email client must be able to view images from {% ifversion fpt or ghec %}`[email protected]`{% else %}the `no-reply` email address {% ifversion ghes %}for {% data variables.location.product_location %}, which your site administrator configures{% endif %}{% endif %}.