RUMM-924 CR fix: wording

Co-authored-by: Alex Costanza <acgh@users.noreply.github.com>

docs/rum_collection.md

@@ -282,7 +282,7 @@ For more details and available options, refer to the code documentation comments
 
 ## Data scrubbing
 
-To modify RUM event attributes before it is send to Datadog or to drop particular event entirely, use event mappers API when configuring the SDK:
+To modify the attributes of a RUM event before it is sent to Datadog or to drop an event entirely, use the event mappers API when configuring the SDK:
 ```swift
 Datadog.Configuration
     .builderUsing(...)
@@ -300,17 +300,17 @@ Datadog.Configuration
     }
     .build()
 ```
-Each mapper is a Swift closure with a signature of `(T) -> T?`, where `T` is a concrete RUM event type. This allows changing portions of the event before it gets send, for example to redact sensitive information in RUM Resource's `url` you may implement custom `redacted(_:) -> String` function and use it in `RUMResourceEventMapper`:
+Each mapper is a Swift closure with a signature of `(T) -> T?`, where `T` is a concrete RUM event type. This allows changing portions of the event before it gets sent, for example to redact sensitive information in RUM Resource's `url` you may implement a custom `redacted(_:) -> String` function and use it in `RUMResourceEventMapper`:
 ```swift
 .setRUMResourceEventMapper { resourceEvent in
     var resourceEvent = resourceEvent
     resourceEvent.resource.url = redacted(resourceEvent.resource.url)
     return resourceEvent
 }
 ```
-Returning `nil` from the mapper will drop the event entirely (it won't be send to Datadog).
+Returning `nil` from the mapper will drop the event entirely (it won't be sent to Datadog).
 
-Only some properties on each event can be mutated:
+Depending on a given event's type, only some specific properties can be mutated:
 
 | Event Type        | Attribute key                     | Description                                     |
 |-------------------|-----------------------------------|-------------------------------------------------|