Update proposals/4186-simplified-sliding-sync.md

Co-authored-by: Hubert Chathi <hubert@uhoreg.ca>

proposals/4186-simplified-sliding-sync.md

@@ -113,7 +113,7 @@ the room's index in the filtered list is within the list's range.
 
 Rooms are ordered by last activity, based on when the last event in the room was received by the server. The exact
 ordering is determined by the server implementation. (Typically, this would be essentially based on when the "server
-received" the last event in the room, however the preside definition depends on the server architecture, especially for
+received" the last event in the room, however the precise definition depends on the server architecture, especially for
 servers that are "distributed").
 
 > [!Important]