Document Transcription.orientation in exports

content/project/export/index.md

@@ -128,6 +128,7 @@ id | `VARCHAR(37)` | UUID of the transcription.
 element_id | `VARCHAR(37)` | UUID of the element this transcription is attached to.
 text | `TEXT` | Text of the transcription.
 confidence | `REAL` | Confidence level reported by the worker, between 0 and 1. Nullable.
+orientation | `TEXT` | [Text orientation](@/project/transcription.md#text-orientation): `horizontal-lr`, `horizontal-rl`, `vertical-lr` or `vertical-rl`.
 worker_version_id | `VARCHAR(37)` | UUID of a worker version that created this transcription. Nullable.
 
 ### transcription_entity