update comment

Signed-off-by: Tim Vaillancourt <[email protected]>

go/logic/applier.go

@@ -937,8 +937,8 @@ func (this *Applier) CreateAtomicCutOverSentryTable() error {
 	return nil
 }
 
-// InitAtomicCutOverIdleTimeout sets the cut-over session wait_timeout, returning a func() to rollback
-// to the original wait_timeout and an error, if any.
+// InitAtomicCutOverIdleTimeout sets the cut-over session wait_timeout in order to reduce the
+// time an unresponsive (but still connected) gh-ost process can hold the cut-over lock.
 func (this *Applier) InitAtomicCutOverIdleTimeout(tx *gosql.Tx) error {
 	cutOverIdleTimeoutSeconds := this.migrationContext.CutOverLockTimeoutSeconds * 2
 	this.migrationContext.Log.Infof("Setting cut-over idle timeout as %d seconds", cutOverIdleTimeoutSeconds)