fix Accept header typo
fix Accept header typo

cnbin/http-api-design-ZH_CN,Dreampie/http-api-design-ZH_CN,tuohang/http-api-design-ZH_CN,wujuguang/http-api-design-ZH_CN,sany620/http-api-design-ZH_CN,ZhangBohan/http-api-design-ZH_CN