docs: update docs on observe live location shares

Author: torrybr

crates/matrix-sdk/src/room/mod.rs

@@ -3171,7 +3171,7 @@ impl Room {
 
     /// Observe live location sharing events for this room.
     ///
-    /// The returned receiver will receive the newest event for each sync
+    /// The returned observable will receive the newest event for each sync
     /// response that contains a `m.beacon` event.
     pub fn observe_live_location_shares(&self) -> ObservableLiveLocation {
         ObservableLiveLocation::new(&self.client, self.room_id())