Show Graphql type descriptions

app/graphql/types/award_emojis/award_emoji_type.rb

doc/api/graphql/reference/gitlab_schema.graphql

doc/api/graphql/reference/gitlab_schema.json

doc/api/graphql/reference/index.md

...graphql/types/design_management/design_collection_type.rb

ee/app/graphql/types/design_management/design_type.rb

...phql/types/design_management/design_version_event_enum.rb

ee/app/graphql/types/epic_descendant_count_type.rb

ee/app/graphql/types/epic_issue_type.rb

ee/app/graphql/types/epic_state_enum.rb

ee/app/graphql/types/epic_state_event_enum.rb

ee/app/graphql/types/epic_tree/epic_tree_node_input_type.rb

ee/app/graphql/types/epic_type.rb

ee/app/graphql/types/permission_types/epic.rb

lib/gitlab/graphql/docs/renderer.rb

lib/gitlab/graphql/docs/templates/default.md.haml