docs: typo fixes in the code sample for body_filter_by_lua. thanks cyberty for reporting this issue as #261.

README

@@ -938,7 +938,7 @@ Directives
             # fastcgi_pass/proxy_pass/...
 
             header_filter_by_lua 'ngx.header.content_length = nil';
-            body_filter_by_lua 'ngx.arg[1] = {string.len(arg[1]), "\n"}'
+            body_filter_by_lua 'ngx.arg[1] = string.len(ngx.arg[1]) .. "\\n"';
         }
 
     Note that the following API functions are currently disabled within this

README.markdown

@@ -832,7 +832,7 @@ When the Lua code may change the length of the response body, then it is require
         # fastcgi_pass/proxy_pass/...
 
         header_filter_by_lua 'ngx.header.content_length = nil';
-        body_filter_by_lua 'ngx.arg[1] = {string.len(arg[1]), "\n"}'
+        body_filter_by_lua 'ngx.arg[1] = string.len(ngx.arg[1]) .. "\\n"';
     }
 
 

doc/HttpLuaModule.wiki

@@ -804,7 +804,7 @@ When the Lua code may change the length of the response body, then it is require
         # fastcgi_pass/proxy_pass/...
 
         header_filter_by_lua 'ngx.header.content_length = nil';
-        body_filter_by_lua 'ngx.arg[1] = {string.len(arg[1]), "\n"}'
+        body_filter_by_lua 'ngx.arg[1] = string.len(ngx.arg[1]) .. "\\n"';
     }
 </geshi>