Remove the duplicated words in code comments

Although it is spelling mistakes, it might make an affects while reading.

Signed-off-by: Kim Bao Long <longkb@vn.fujitsu.com>

stage0/app_start.go

@@ -70,7 +70,7 @@ func StartApp(cfg StartConfig) error {
 	//    In this window rkt app list may report that the application exited.
 	// 2. remove the app status file
 	//    In this window rkt app list may report that the app was created.
-	// 3. re-create the the app-started file
+	// 3. re-create the app-started file
 
 	_ = os.Remove(appStartedPath)
 	_ = os.Remove(appStatusPath)

stage1/init/common/path.go

@@ -25,7 +25,7 @@ import (
 )
 
 const (
-	// UnitsDir is the default path to systemd systemd unit directory
+	// UnitsDir is the default path to systemd unit directory
 	UnitsDir        = "/usr/lib/systemd/system"
 	envDir          = "/rkt/env"
 	statusDir       = "/rkt/status"

store/imagestore/migrate_test.go

@@ -406,7 +406,7 @@ func (d *DBV7) compare(td testdb) bool {
 // The latest existing struct should be updated when updating the db version
 // without changing the struct format (ex. V0_1 to V0_2).
 // A new struct and its relative function should be added if the format is changed.
-// The same applies for all of the the other structs.
+// The same applies for all of the other structs.
 type ACIInfoV0_2 struct {
 	BlobKey    string
 	AppName    string