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>

templates/swagger/v1_json.tmpl

@@ -15282,7 +15282,7 @@
           },
           {
             "type": "boolean",
-            "description": "filter (exclude / include) drafts, if you dont have repo write access none will show",
+            "description": "filter (exclude / include) drafts, if you don't have repo write access none will show",
             "name": "draft",
             "in": "query"
           },