Update graphql.md

docs/en/features/graphql.md

@@ -1,23 +1,22 @@
 # API Documentation
 
-- [API Documentation](#api-documentation)
+- [Characteristics](#characteristics)
-  - [Characteristics](#characteristics)
+- [GraphQL](#graphql)
-  - [GraphQL](#graphql)
+- [Making API requests](#making-api-requests)
-  - [Making API requests](#making-api-requests)
   - [Supported clients](#supported-clients)
     - [GraphiQL](#graphiql)
     - [Postman](#postman)
     - [HTTP libraries](#http-libraries)
-  - [Available information:](#available-information)
+- [Available information:](#available-information)
-  - [Examples of queries](#examples-of-queries)
+- [Examples of queries](#examples-of-queries)
   - [Request a single record from a collection](#request-a-single-record-from-a-collection)
   - [Request a complete collection](#request-a-complete-collection)
     - [Pagination](#pagination)
   - [Accessing several resources in a single request](#accessing-several-resources-in-a-single-request)
-  - [Security limitations](#security-limitations)
+- [Security limitations](#security-limitations)
   - [Example of too deep query](#example-of-too-deep-query)
   - [Example of too complex query](#example-of-too-complex-query)
-  - [Code examples](#code-examples)
+- [Code examples](#code-examples)
 
 ## Characteristics