Fix sed induced typo

src/core/lib/iomgr/timer.c

@@ -278,9 +278,8 @@ static int refill_queue(shard_type *shard, gpr_timespec now) {
   return !grpc_timer_heap_is_empty(&shard->heap);
 }
 
-/* This pollent the next non-cancelled timer with deadline <= now from the
-   queue,
-   or returns NULL if there isn't one.
+/* This pops the next non-cancelled timer with deadline <= now from the
+   queue, or returns NULL if there isn't one.
    REQUIRES: shard->mu locked */
 static grpc_timer *pop_one(shard_type *shard, gpr_timespec now) {
   grpc_timer *timer;