Line up text and yaml for probabilistic segmentations

According to @tsalo the density entity should not be allowed for gifti files,
but I don't know how to reflect that in the yaml, so I'm leaving it as slightly
too permissive.

Author: mguaypaq

src/derivatives/imaging.md

@@ -412,7 +412,10 @@ Template:
     sub-<label>/
         [ses-<label>/]
             anat/
-                <source_entities>[_hemi-{L|R}][_space-<space>][_seg-<label>][_res-<label>][_den-<label>][_desc-<label>]_dseg.{label.gii|dlabel.nii}
+                <source_entities>[_hemi-{L|R}][_space-<space>][_seg-<label>][_res-<label>][_den-<label>][_desc-<label>]_dseg.json
+                <source_entities>[_hemi-{L|R}][_space-<space>][_seg-<label>][_den-<label>][_desc-<label>]_dseg.label.gii
+                <source_entities>[_hemi-{L|R}][_space-<space>][_seg-<label>][_res-<label>][_den-<label>][_desc-<label>]_dseg.dlabel.nii
+                <source_entities>[_hemi-{L|R}][_space-<space>][_seg-<label>][_res-<label>][_den-<label>][_desc-<label>]_dseg.tsv
 ```
 
 The [`hemi-<label>`](../appendices/entities.md#hemi) entity is REQUIRED for GIFTI files storing information about

src/schema/rules/files/deriv/imaging.yaml

@@ -220,6 +220,7 @@ anat_parametric_discrete_surface:
     $ref: rules.files.raw.anat.parametric.entities
     hemisphere: optional
     space: optional
+    segmentation: optional
     resolution: optional
     density: optional
     description: optional
@@ -237,6 +238,7 @@ anat_nonparametric_discrete_surface:
     $ref: rules.files.raw.anat.nonparametric.entities
     hemisphere: optional
     space: optional
+    segmentation: optional
     resolution: optional
     density: optional
     description: optional