fix: Use mount_path to narrow down urls_for

Author: chibicco

lib/grape-swagger/rake/oapi_tasks.rb

@@ -95,7 +95,7 @@ def make_request(url)
       def urls_for(api_class)
         api_class.routes
                  .map(&:path)
-                 .select { |e| e.include?('doc') }
+                 .grep(/#{GrapeSwagger::DocMethods.class_variable_get(:@@mount_path)}\(\.json\)$/)
                  .reject { |e| e.include?(':name') }
                  .map { |e| format_path(e) }
                  .map { |e| [e, ENV.fetch('resource', nil)].join('/').chomp('/') }