add units to electrode table

Author: h-mayorquin

core/nwb.ecephys.yaml

@@ -288,17 +288,17 @@ groups:
   - name: x
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: x coordinate of the channel location in the brain (+x is posterior).
+    doc: x coordinate of the channel location in the brain (+x is posterior). Units should be specified in microns.
     quantity: '?'
   - name: y
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: y coordinate of the channel location in the brain (+y is inferior).
+    doc: y coordinate of the channel location in the brain (+y is inferior). Units should be specified in microns.
     quantity: '?'
   - name: z
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: z coordinate of the channel location in the brain (+z is right).
+    doc: z coordinate of the channel location in the brain (+z is right). Units should be specified in microns.
     quantity: '?'
   - name: imp
     neurodata_type_inc: VectorData
@@ -313,17 +313,17 @@ groups:
   - name: rel_x
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: x coordinate in electrode group
+    doc: x coordinate in electrode group. Units should be specified in microns.
     quantity: '?'
   - name: rel_y
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: y coordinate in electrode group
+    doc: y coordinate in electrode group. Units should be specified in microns.
     quantity: '?'
   - name: rel_z
     neurodata_type_inc: VectorData
     dtype: float32
-    doc: z coordinate in electrode group
+    doc: z coordinate in electrode group. Units should be specified in microns.
     quantity: '?'
   - name: reference
     neurodata_type_inc: VectorData