doc: http logger (Chinese)

[sshniro]

Issue description

The English version is available here.
https://github.com/apache/incubator-apisix/blob/master/doc/plugins/http-logger.md

[hiproz]

i can try this

[sshniro]

If possible please also remove the , at the end of the uri :)

"plugins": {
            "http-logger": {
                 "uri": "127.0.0.1:80/postendpoint?param=1",
            }
       },

[scaat]

I have added Chinese documents，and remove the ,.

[hiproz]

good job @scaat ,this issue can be closed after the confirm @membphis