Updated the 'consistency-modes' consul.io/api link to point to its new location (#5572)

Ref: 626392eb62

Signed-off-by: Samuel Alfageme <samuel@alfage.me>

docs/configuration/configuration.md

@@ -359,7 +359,7 @@ tags:
 # The string by which Consul tags are joined into the tag label.
 [ tag_separator: <string> | default = , ]
 
-# Allow stale Consul results (see https://www.consul.io/api/index.html#consistency-modes). Will reduce load on Consul.
+# Allow stale Consul results (see https://www.consul.io/api/features/consistency.html). Will reduce load on Consul.
 [ allow_stale: <bool> ]
 
 # The time after which the provided names are refreshed.