doc: sync the change from README.markdown to wiki

Author: doujiang24

doc/HttpLuaModule.wiki

@@ -6411,7 +6411,7 @@ This API was first introduced in the <code>0.9.5</code> release.
 
 '''syntax:''' ''count = ngx.worker.count()''
 
-'''context:''' ''set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*, init_by_lua*''
+'''context:''' ''set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*, init_by_lua*, init_worker_by_lua*''
 
 Returns the total number of the Nginx worker processes (i.e., the value configured
 by the [http://nginx.org/en/docs/ngx_core_module.html#worker_processes worker_processes]