Auto merge of rust-lang#80860 - camelid:nodeid-docs, r=sanxiyn

Document `NodeId`

compiler/rustc_ast/src/node_id.rs

@@ -2,19 +2,25 @@ use rustc_span::ExpnId;
 use std::fmt;
 
 rustc_index::newtype_index! {
+    /// Identifies an AST node.
+    ///
+    /// This identifies top-level definitions, expressions, and everything in between.
+    /// This is later turned into [`DefId`] and `HirId` for the HIR.
+    ///
+    /// [`DefId`]: rustc_span::def_id::DefId
     pub struct NodeId {
         DEBUG_FORMAT = "NodeId({})"
     }
 }
 
 rustc_data_structures::define_id_collections!(NodeMap, NodeSet, NodeId);
 
-/// `NodeId` used to represent the root of the crate.
+/// The [`NodeId`] used to represent the root of the crate.
 pub const CRATE_NODE_ID: NodeId = NodeId::from_u32(0);
 
-/// When parsing and doing expansions, we initially give all AST nodes this AST
-/// node value. Then later, during expansion, we renumber them to have small,
-/// positive ids.
+/// When parsing and at the beginning of doing expansions, we initially give all AST nodes
+/// this dummy AST [`NodeId`]. Then, during a later phase of expansion, we renumber them
+/// to have small, positive IDs.
 pub const DUMMY_NODE_ID: NodeId = NodeId::MAX;
 
 impl NodeId {