docs: Add API reference for NodeEntry

docs/api/nodes/README.md

@@ -10,6 +10,7 @@ type Ancestor = Editor | Element
 ```
 
 - [Node](./node.md)
+- [NodeEntry](./node-entry.md)
 - [Editor](./editor.md)
 - [Element](./element.md)
 - [Text](./text.md)

docs/api/nodes/node-entry.md

@@ -0,0 +1,9 @@
+# NodeEntry
+
+`NodeEntry` objects are returned when iterating over the nodes in a Slate document tree. They consist of the node and its `Path` relative to the root node in the document.
+
+They are generics meaning that sometimes they will return a subset of `Node` types like an `Element` or `Text`.
+
+```typescript
+type NodeEntry<T extends Node = Node> = [T, Path]
+```