docs: update raft docs with new file-based TLS params

Author: calvn

website/pages/docs/configuration/storage/raft.mdx

@@ -96,13 +96,29 @@ time. To use Raft for HA coordination users must also use Raft for storage.
 
 ### `retry_join` stanza
 
-- `leader_api_addr` `(string: "")` - Address of a possible leader node
+- `leader_api_addr` `(string: "")` - Address of a possible leader node.
 
-- `leader_ca_cert` `(string: "")` - CA cert of the possible leader node
+- `leader_ca_cert_file` `(string: "")` - File path to the CA cert of the
+  possible leader node.
 
-- `leader_client_cert` `(string: "")` - Client certificate for the follower node to establish client authentication with the possible leader node
+- `leader_client_cert_file` `(string: "")` -File path to the client certificate
+for the follower node to establish client authentication with the possible
+leader node.
 
-- `leader_client_key` `(string: "")` - Client key for the follower node to establish client authentication with the possible leader node
+- `leader_client_key_file` `(string: "")` - File path to the client key for the
+follower node to establish client authentication with the possible leader node.
+
+- `leader_ca_cert` `(string: "")` - CA cert of the possible leader node.
+
+- `leader_client_cert` `(string: "")` - Client certificate for the follower node
+to establish client authentication with the possible leader node.
+
+- `leader_client_key` `(string: "")` - Client key for the follower node to
+establish client authentication with the possible leader node.
+
+Each `retry_join` block may provide TLS certificates via file paths or as a
+single-line certificate string value with newlines delimited by `\n`, but not a
+combination of both.
 
 Example Configuration:
 ```
@@ -111,21 +127,21 @@ storage "raft" {
   node_id = "node1"
   retry_join {
     leader_api_addr = "http://127.0.0.2:8200"
-    leader_ca_cert = "/path/to/ca1"
-    leader_client_cert = "/path/to/client/cert1"
-    leader_client_key = "/path/to/client/key1"
+    leader_ca_cer_file = "/path/to/ca1"
+    leader_client_cert_file = "/path/to/client/cert1"
+    leader_client_key_file = "/path/to/client/key1"
   }
   retry_join {
     leader_api_addr = "http://127.0.0.3:8200"
-    leader_ca_cert = "/path/to/ca2"
-    leader_client_cert = "/path/to/client/cert2"
-    leader_client_key = "/path/to/client/key2"
+    leader_ca_cert_file = "/path/to/ca2"
+    leader_client_cert_file = "/path/to/client/cert2"
+    leader_client_key_file = "/path/to/client/key2"
   }
   retry_join {
     leader_api_addr = "http://127.0.0.4:8200"
-    leader_ca_cert = "/path/to/ca3"
-    leader_client_cert = "/path/to/client/cert3"
-    leader_client_key = "/path/to/client/key3"
+    leader_ca_cert_file = "/path/to/ca3"
+    leader_client_cert_file = "/path/to/client/cert3"
+    leader_client_key_file = "/path/to/client/key3"
   }
 }
 ```