Fix import ID syntax in manifest import docs

Author: alexsomesan

website/docs/r/manifest.html.markdown

@@ -109,7 +109,7 @@ terraform import kubernetes_manifest.secret_sample "apiVersion=v1,kind=Secret,na
 ```
 
 Note the import ID as the last argument to the import command. This ID points Terraform at which Kubernetes object to read when importing.
-It should be constructed with the following syntax: `"<apiVersion>#<Kind>#<metadata.namespace>#<metadata.name>"`
+It should be constructed with the following syntax: `"apiVersion=<string>,kind=<string>,[namespace=<string>,]name=<string>"`
 
 ## Using `wait_for` to block create and update calls