m.key.verification.start: remove wording that it is typically to-device

It can be either a to-device event or an in-room event.

Signed-off-by: Sumner Evans <sumner.evans@automattic.com>

data/event-schemas/schema/m.key.verification.start.yaml

@@ -3,9 +3,9 @@ allOf:
   - $ref: core-event-schema/event.yaml
 
 description: |-
-  Begins a key verification process. Typically sent as a [to-device](/client-server-api/#send-to-device-messaging) event. The `method`
+  Begins a key verification process. The `method` field determines the type of
-  field determines the type of verification. The fields in the event will differ depending
+  verification. The fields in the event will differ depending on the `method`.
-  on the `method`. This definition includes fields that are in common among all variants.
+  This definition includes fields that are in common among all variants.
 properties:
   content:
     properties: