Typo: stab_status -> stub_status (netdata#4984)

##### Summary

Typo: `stab_status` -> `stub_status`

##### Component Name

Docs / readme.

##### Additional Information

None.

collectors/python.d.plugin/web_log/README.md

@@ -21,7 +21,7 @@ netdata turns this "useless" log file, into a powerful performance and health mo
 If netdata is installed on a system running a web server, it will detect it and it will automatically present a series of charts, with information obtained from the web server API, like these (*these do not come from the web server log file*):
 
 ![image](https://cloud.githubusercontent.com/assets/2662304/22900686/e283f636-f237-11e6-93d2-cbdf63de150c.png)
-*[**netdata**](https://my-netdata.io/) charts based on metrics collected by querying the `nginx` API (i.e. `/stab_status`).*
+*[**netdata**](https://my-netdata.io/) charts based on metrics collected by querying the `nginx` API (i.e. `/stub_status`).*
 
 > [**netdata**](https://my-netdata.io/) supports `apache`, `nginx`, `lighttpd` and `tomcat`. To obtain real-time information from a web server API, the web server needs to expose it. For directions on configuring your web server, check the config files for each web server. There is a directory with a config file for each web server under [`/etc/netdata/python.d/`](../).