Update issue.go with labels documentation (labels content, not ids) (#35522)

For https://github.com/go-gitea/gitea/issues/35521

---------

Signed-off-by: Fabien Benetou <fabien-services@benetou.fr>

routers/api/v1/repo/issue.go

@@ -351,7 +351,7 @@ func ListIssues(ctx *context.APIContext) {
 	//   enum: [closed, open, all]
 	// - name: labels
 	//   in: query
-	//   description: comma separated list of labels. Fetch only issues that have any of this labels. Non existent labels are discarded
+	//   description: comma separated list of label names. Fetch only issues that have any of this label names. Non existent labels are discarded.
 	//   type: string
 	// - name: q
 	//   in: query

templates/swagger/v1_json.tmpl

@@ -9109,7 +9109,7 @@
           },
           {
             "type": "string",
-            "description": "comma separated list of labels. Fetch only issues that have any of this labels. Non existent labels are discarded",
+            "description": "comma separated list of label names. Fetch only issues that have any of this label names. Non existent labels are discarded.",
             "name": "labels",
             "in": "query"
           },