Improving documentation of error_log (Was: Bad requests with 0-byte response)

[Anton Yuzhaninov]

Jean-Baptiste Quenot wrote:
> You say that the wiki follows Igor's russian documentation, but I
> don't understand why error_log is not documented there:
> 
> http://sysoev.ru/nginx/docs/ngx_core_module.html
> 

On http://sysoev.ru/nginx/docs/ is not documented many old directives.
Most new ones is documented, when added.

-- 
 Anton Yuzhaninov