Fix typos in code comments: doesnt, dont, wont (#36890)

Fix missing apostrophes in contractions across multiple source files.

Changes:
- `doesnt` -> `doesn't` in `routers/api/v1/repo/git_ref.go` (2
occurrences)
- `dont` -> `don't` in `models/activities/notification_list.go`,
`modules/indexer/code/bleve/token/path/path.go`,
`routers/api/v1/repo/release.go`,
`services/migrations/gitea_downloader.go`,
`services/repository/contributors_graph.go`
- `wont` -> `won't` in `routers/api/v1/repo/issue_subscription.go`,
`models/issues/label_test.go`

Ref: #35015 (good first issues - improve English)

---------

Co-authored-by: majianhan <majianhan@kylinos.cn>
Co-authored-by: silverwind <me@silverwind.io>

services/migrations/gitea_downloader.go

@@ -186,7 +186,7 @@ func (g *GiteaDownloader) GetMilestones(ctx context.Context) ([]*base.Milestone,
 		}
 
 		for i := range ms {
-			// old gitea instances dont have this information
+			// old gitea instances don't have this information
 			createdAT := time.Time{}
 			var updatedAT *time.Time
 			if ms[i].Closed != nil {

services/repository/contributors_graph.go

@@ -84,7 +84,7 @@ func GetContributorStats(ctx context.Context, cache cache.StringCache, repo *rep
 	if !cache.IsExist(cacheKey) {
 		genReady := make(chan struct{})
 
-		// dont start multiple async generations
+		// don't start multiple async generations
 		_, run := generateLock.Load(cacheKey)
 		if run {
 			return nil, ErrAwaitGeneration