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>

modules/indexer/code/bleve/token/path/path.go

@@ -27,7 +27,7 @@ func TokenFilterConstructor(config map[string]any, cache *registry.Cache) (analy
 
 func (s *TokenFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
 	if len(input) == 1 {
-		// if there is only one token, we dont need to generate the reversed chain
+		// if there is only one token, we don't need to generate the reversed chain
 		return generatePathTokens(input, false)
 	}