fix(api): document X-Total-Count instead of non-existent X-Total header (#38717)

The `CommitList` and `ChangedFileList` swagger responses documented an
`X-Total` response header that their endpoints never send, they send
`X-Total-Count` via `SetTotalCountHeader`. This renames the documented
header and regenerates the spec.

`repoGetAllCommits` also uses `CommitList` and sends both headers, so
the new name is accurate for all three endpoints.

Also corrects `ChangedFileList` describing its headers as commit counts.

Documentation only, no handler behaviour changes.

Fixes https://github.com/go-gitea/gitea/issues/22048

---------

Signed-off-by: davidpavlovschi <davidpavlov2048@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>

routers/api/v1/swagger/repo.go

@@ -248,7 +248,7 @@ type swaggerCommitList struct {
 	PerPage int `json:"X-PerPage"`
 
 	// Total commit count
-	Total int `json:"X-Total"`
+	Total int `json:"X-Total-Count"`
 
 	// Total number of pages
 	PageCount int `json:"X-PageCount"`
@@ -266,11 +266,11 @@ type swaggerChangedFileList struct {
 	// The current page
 	Page int `json:"X-Page"`
 
-	// Commits per page
+	// Files per page
 	PerPage int `json:"X-PerPage"`
 
-	// Total commit count
-	Total int `json:"X-Total"`
+	// Total file count
+	Total int `json:"X-Total-Count"`
 
 	// Total number of pages
 	PageCount int `json:"X-PageCount"`