sched: fix Dump's doc comment

pkg/scheduler/internal/cache/cache.go

@@ -170,7 +170,7 @@ func (cache *schedulerCache) removeNodeInfoFromList(name string) {
 	delete(cache.nodes, name)
 }
 
-// Snapshot takes a snapshot of the current scheduler cache. This is used for
+// Dump produces a dump of the current scheduler cache. This is used for
 // debugging purposes only and shouldn't be confused with UpdateSnapshot
 // function.
 // This method is expensive, and should be only used in non-critical path.