Updated back the comments and file layout

Author: andreilitvin

src/app/AttributeValueDecoder.h

@@ -54,9 +54,15 @@ class AttributeValueDecoder
 
     bool TriedDecode() const { return mTriedDecode; }
 
-    const Access::SubjectDescriptor & GetSubjectDescriptor() const { return mSubjectDescriptor; }
+    /**
+     * The accessing fabric index for this write interaction.
+     */
+    FabricIndex AccessingFabricIndex() const { return mSubjectDescriptor.fabricIndex; }
 
-    FabricIndex AccessingFabricIndex() const { return GetSubjectDescriptor().fabricIndex; }
+    /**
+     * The accessing subject descriptor for this write interaction.
+     */
+    const Access::SubjectDescriptor & GetSubjectDescriptor() const { return mSubjectDescriptor; }
 
 private:
     TLV::TLVReader & mReader;

src/app/AttributeValueEncoder.h

@@ -149,6 +149,9 @@ class AttributeValueEncoder
 
     const Access::SubjectDescriptor & GetSubjectDescriptor() const { return mSubjectDescriptor; }
 
+    /**
+     * The accessing fabric index for this read or subscribe interaction.
+     */
     FabricIndex AccessingFabricIndex() const { return GetSubjectDescriptor().fabricIndex; }
 
     /**