Docs: fix broken configuration links
Fixing the broken links to relative configuration sections.
@@ -51,9 +51,9 @@ to announce service IPs. Jump to:
- [Layer 2 configuration](#layer-2-configuration)
- [BGP configuration](#bgp-configuration)
-- [Advanced BGP configuration](./_advanced_bgp_configuration.md)
-- [Advanced L2 configuration](./_advanced_l2_configuration.md)
-- [Advanced IPAddressPool configuration](./_advanced_ipaddresspool_configuration.md)
+- [Advanced BGP configuration](./_advanced_bgp_configuration)
+- [Advanced L2 configuration](./_advanced_l2_configuration)
+- [Advanced IPAddressPool configuration](./_advanced_ipaddresspool_config/)
Note: it is possible to announce the same service both via L2 and via BGP (see the relative
[FAQ](../faq/_index.md)).
