Fix compare api swagger (#30648)

The swagger format on #30349 is not right. This PR will fix it.

routers/api/v1/repo/compare.go

@@ -16,7 +16,7 @@ import (
 
 // CompareDiff compare two branches or commits
 func CompareDiff(ctx *context.APIContext) {
-	// swagger:operation GET /repos/{owner}/{repo}/compare/{basehead} Get commit comparison information
+	// swagger:operation GET /repos/{owner}/{repo}/compare/{basehead} repository repoCompareDiff
 	// ---
 	// summary: Get commit comparison information
 	// produces:

templates/swagger/v1_json.tmpl

@@ -5346,12 +5346,10 @@
           "application/json"
         ],
         "tags": [
-          "Get",
-          "commit",
-          "comparison"
+          "repository"
         ],
         "summary": "Get commit comparison information",
-        "operationId": "information",
+        "operationId": "repoCompareDiff",
         "parameters": [
           {
             "type": "string",