Added note that changes to permissions configuration file persist across restarts

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

docs/Permissions/Permissioning.md

@@ -27,6 +27,8 @@ Alternatively, update the [`permissions_config.toml`](#permissions-configuration
 [`perm_reloadPermissionsFromFile`](../Reference/JSON-RPC-API-Methods.md#perm_reloadpermissionsfromfile) method 
 to update the whitelists. 
 
+Updates to the permissions configuration file persist across node restarts. 
+
 To view the nodes whitelist, use the [perm_getNodesWhitelist](../Reference/JSON-RPC-API-Methods.md#perm_getNodesWhiteList) method. 
 
 !!! note
@@ -117,6 +119,8 @@ Alternatively, update the [`permissions_config.toml`](#permissions-configuration
 [`perm_reloadPermissionsFromFile`](../Reference/JSON-RPC-API-Methods.md#perm_reloadpermissionsfromfile) method 
 to update the whitelists.
 
+Updates to the permissions configuration file persist across node restarts.
+
 To view the accounts whitelist, use the [`perm_getAccountsWhitelist`](../Reference/JSON-RPC-API-Methods.md#perm_getAccountsWhitelist) method.
 
 ### Enabling Account Whitelisting