Fix Memcached docs

Signed-off-by: Muhammad Raisul Islam Evan <[email protected]>

docs/guides/memcached/cli/cli.md

@@ -292,5 +292,5 @@ $ kubectl delete memcached <name>
 ## Next Steps
 
 - Learn how to use KubeDB to run a Memcached server [here](/docs/guides/memcached/README.md).
-- Learn how to use custom configuration in Memcached with KubeDB [here](/docs/guides/memcached/custom-configuration/customize-configuration)
+- Learn how to use custom configuration in Memcached with KubeDB [here](/docs/guides/memcached/custom-configuration/using-config-file)
 - Want to hack on KubeDB? Check our [contribution guidelines](/docs/CONTRIBUTING.md).

docs/guides/memcached/concepts/memcached.md

@@ -104,7 +104,7 @@ Memcached managed by KubeDB can be monitored with builtin-Prometheus and Prometh
 
 ### spec.configSecret
 
-`spec.configSecret` is an optional field that allows users to provide custom configuration for Memcached. This field accepts a [`VolumeSource`](https://github.com/kubernetes/api/blob/release-1.11/core/v1/types.go#L47). So you can use any Kubernetes supported volume source such as `configMap`, `secret`, `azureDisk` etc. To learn more about how to use a custom configuration file see [here](/docs/guides/memcached/custom-configuration/customize-configuration).
+`spec.configSecret` is an optional field that allows users to provide custom configuration for Memcached. This field accepts a [`VolumeSource`](https://github.com/kubernetes/api/blob/release-1.11/core/v1/types.go#L47). So you can use any Kubernetes supported volume source such as `configMap`, `secret`, `azureDisk` etc. To learn more about how to use a custom configuration file see [here](/docs/guides/memcached/custom-configuration/using-config-file).
 
 ### spec.podTemplate