Fix swagger title (#28164)

![image](https://github.com/go-gitea/gitea/assets/18380374/380859b2-a643-42fd-b53e-78c93c05c826)
Don't know why there's a `.` behind. 🤔

routers/api/v1/api.go

@@ -2,7 +2,7 @@
 // Copyright 2016 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-// Package v1 Gitea API.
+// Package v1 Gitea API
 //
 // This documentation describes the Gitea API.
 //

templates/swagger/v1_json.tmpl

@@ -14,7 +14,7 @@
   "swagger": "2.0",
   "info": {
     "description": "This documentation describes the Gitea API.",
-    "title": "Gitea API.",
+    "title": "Gitea API",
     "license": {
       "name": "MIT",
       "url": "http://opensource.org/licenses/MIT"