[SCHEMA] Add "directories" description for "study" DatasetType and add "docs" where was missing

src/schema/rules/directories.yaml

@@ -1,5 +1,5 @@
 ---
-# This file defines layouts of directories.
+# This file defines layouts of directories for each DatasetType
 #
 # A layout defines a collection of directory specifiers.
 # Each specifier has a naming convention, requirement level, opacity, and subdirectories.
@@ -16,10 +16,40 @@
 # The special "root" specifier describes the root of the dataset and only defines subdirectories.
 # No naming convention applies, and the requirement level and opacity would be superfluous.
 #
+study:
+  root:
+    subdirs:
+      - code
+      - docs
+      - derivatives
+      - logs
+      - sourcedata
+  code:
+    name: code
+    level: optional
+    opaque: true
+  docs:
+    name: docs
+    level: optional
+    opaque: true
+  derivatives:
+    name: derivatives
+    level: optional
+    opaque: true
+  logs:
+    name: logs
+    level: optional
+    opaque: true
+  sourcedata:
+    name: sourcedata
+    level: optional
+    opaque: true
+
 raw:
   root:
     subdirs:
       - code
+      - docs
       - derivatives
       - logs
       - phenotype
@@ -77,6 +107,7 @@ derivative:
   root:
     subdirs:
       - code
+      - docs
       - derivatives
       - logs
       - phenotype
@@ -87,6 +118,10 @@ derivative:
     name: code
     level: optional
     opaque: true
+  docs:
+    name: docs
+    level: optional
+    opaque: true
   derivatives:
     name: derivatives
     level: optional