Cleanup: move doc-string into header

source/blender/blenkernel/BKE_node.h

@@ -713,6 +713,11 @@ bNode *node_copy_with_mapping(bNodeTree *dst_tree,
 
 bNode *node_copy(bNodeTree *dst_tree, const bNode &src_node, int flag, bool use_unique);
 
+/**
+ * Free the node itself.
+ *
+ * \note ID user reference-counting and changing the `nodes_by_id` vector are up to the caller.
+ */
 void node_free_node(bNodeTree *tree, bNode *node);
 
 }  // namespace blender::bke

source/blender/blenkernel/intern/node.cc

@@ -2952,11 +2952,6 @@ void nodeRebuildIDVector(bNodeTree *node_tree)
 
 namespace blender::bke {
 
-/**
- * Free the node itself.
- *
- * \note: ID user reference-counting and changing the `nodes_by_id` vector are up to the caller.
- */
 void node_free_node(bNodeTree *ntree, bNode *node)
 {
   /* since it is called while free database, node->id is undefined */