copy edit on personas programmatic partial (#1506)

Author: sanscontext

src/_includes/content/personas.md

@@ -2,6 +2,6 @@
 
 You can send computed traits and audiences generated through [Segment Personas](/docs/personas/) to this destination as a **user property**. To learn more about Personas, contact us for a [demo](https://segment.com/demo).
 
-For user-property destinations, an [identify](/docs/connections/spec/identify/) call will be sent to the destination for each user being added and removed. The property name will be the snake_cased version of the audience name you provide with a true/false value. For example, when a user first completes an order in the last 30 days, we will send an identify call with the property `order_completed_last_30days: true`, and when this user no longer satisfies we will set that value to `false`. 
+For user-property destinations, Personas sends an [Identify call](/docs/connections/spec/identify/) to the destination for each user that is added or removed from an audience. The property name is the `snake_cased` version of the audience name you provide, with a boolean (`true`/`false`) value to indicate if they're a member of the audience. For example, when a user first completes an order in the last 30 days, Personas sends an identify call with the property `order_completed_last_30days: true`, and when this user no longer satisfies these criteria (if the user does not complete another order over 30 days) Personas sends another Identify call to set that value to `false`.
 
-When the audience is first created an identify call is sent for every user in the audience. Subsequent syncs will only send updates for those users which were added or removed since the last sync.
+When Personas first creates the audience, it sends an Identify call for every user in the audience. Later syncs only update users which were added or removed since the last sync.