[DATALAD RUNCMD] Fix typo in SpatialAxes

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "git-sedi SpatialAxis SpatialAxes",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

src/schema/objects/columns.yaml

@@ -397,7 +397,7 @@ reference_frame:
   description: |
     Specification of a reference frame in which the motion data are to be interpreted.
     The description of the levels in `*_channels.json` SHOULD use `RotationRule`,
-    `RotationOrder`, and `SpatialAxis`, and MAY use `Description` for the specification.
+    `RotationOrder`, and `SpatialAxes`, and MAY use `Description` for the specification.
   anyOf:
     - type: string
     - type: string