Fix links in documentation.md for 2021.4.1

* Fix links in architecture.md
* Fix links in example_client/README.md
* Fix links in docker_container.md
* Fix links in east_ocr.md
* Fix links in faces_analysis_dag.md
* Fix links in vehicles_analysis_dag.md
* Fix links in face_detection_script_example.md
* Fix links in face_detection.md
* Fix links in model_server_grpc_api.md
* Fix links in model_server_rest_api.md
* Fix link in models_repository.md

JIRA:CVS-64956