10407 fix documentation link to requests (#10409)

* 10407 fix documentation link to requests

* Append page heading to URL

Co-authored-by: jeremystretch <jstretch@ns1.com>

docs/configuration/system.md

@@ -58,7 +58,7 @@ Email is sent from NetBox only for critical events or if configured for [logging
 
 Default: None
 
-A dictionary of HTTP proxies to use for outbound requests originating from NetBox (e.g. when sending webhook requests). Proxies should be specified by schema (HTTP and HTTPS) as per the [Python requests library documentation](https://2.python-requests.org/en/master/user/advanced/). For example:
+A dictionary of HTTP proxies to use for outbound requests originating from NetBox (e.g. when sending webhook requests). Proxies should be specified by schema (HTTP and HTTPS) as per the [Python requests library documentation](https://requests.readthedocs.io/en/latest/user/advanced/#proxies). For example:
 
 ```python
 HTTP_PROXIES = {