fixup! add doc comment

Author: jmartinesp

crates/matrix-sdk-ui/src/timeline/pinned_events_loader.rs

@@ -26,6 +26,7 @@ use tracing::{debug, warn};
 
 use crate::timeline::event_handler::TimelineEventKind;
 
+/// The max number of concurrent `/event` requests to run when loading pinned events.
 pub const MAX_PINNED_EVENTS_CONCURRENT_REQUESTS: usize = 10;
 
 /// Utility to load the pinned events in a room.