Update authentication.md

Fixed TOC

spec/authentication.md

@@ -10,19 +10,19 @@ permalink: /spec/authentication/
 
 1. [Introduction](#introduction)
 2. [Using JWTs for client authentication](#jwts)
-2.1 [Flow using JWTs](#flow_jwt)
-2.2 [JW identity token](#jw_identity_token)
-2.3 [Request for an access token using JWTs](#request_for_access_token_jwt)
-2.4 [Validation of identity token](#validation_of_identity_token)
-2.5 [Configuration for identity JWTs](#configuration_jwt)
-2.6 [Examples](#examples)
+2.1. [Flow using JWTs](#flow_jwt)
+2.2. [JW identity token](#jw_identity_token)
+2.3. [Request for an access token using JWTs](#request_for_access_token_jwt)
+2.4. [Validation of identity token](#validation_of_identity_token)
+2.5. [Configuration for identity JWTs](#configuration_jwt)
+2.6. [Examples](#examples)
 3. [Using client credentials for access token request](#client_credentials)
-3.1 [Flow using client credentials](#flow_client_credentials)
-3.2 [Request for an access token using a client secret](#request_for_access_token_with_client_credentials)
-3.3 [Validation of client credentials](#validation_of_client_credentials)
-3.4 [Configuration of client credentials](#configuration_client_credentials)
-3.5 [Example request using client credentials](#example_request_client_credentials)
-4 [Notes on access tokens](#notes_on_access_tokens)
+3.1. [Flow using client credentials](#flow_client_credentials)
+3.2. [Request for an access token using a client secret](#request_for_access_token_with_client_credentials)
+3.3. [Validation of client credentials](#validation_of_client_credentials)
+3.4. [Configuration of client credentials](#configuration_client_credentials)
+3.5. [Example request using client credentials](#example_request_client_credentials)
+4. [Notes on access tokens](#notes_on_access_tokens)
 
 ## Introduction <a name="introduction">