Fix typo in KV providers documentation

docs/content/providers/consul.md

@@ -64,7 +64,7 @@ Defines a username to connect to Consul with.
 providers:
   consul:
     # ...
-    usename: "foo"
+    username: "foo"
 ```
 
 ```toml tab="File (TOML)"

docs/content/providers/etcd.md

@@ -64,7 +64,7 @@ Defines a username with which to connect to etcd.
 providers:
   etcd:
     # ...
-    usename: "foo"
+    username: "foo"
 ```
 
 ```toml tab="File (TOML)"

docs/content/providers/redis.md

@@ -64,7 +64,7 @@ Defines a username to connect with Redis.
 providers:
   redis:
     # ...
-    usename: "foo"
+    username: "foo"
 ```
 
 ```toml tab="File (TOML)"

docs/content/providers/zookeeper.md

@@ -64,7 +64,7 @@ Defines a username to connect with ZooKeeper.
 providers:
   zooKeeper:
     # ...
-    usename: "foo"
+    username: "foo"
 ```
 
 ```toml tab="File (TOML)"