doc: remove misleading comments

Author: huydo862003

packages/dbml-parse/src/core/types/symbol/symbols.ts

@@ -92,7 +92,7 @@ export class NodeSymbolIdGenerator {
 export class NodeSymbol implements Internable<InternedNodeSymbol> {
   id: NodeSymbolId;
   kind: SymbolKind;
-  // The AST node that declares this symbol (undefined for synthetic symbols).
+  // The AST node that declares this symbol
   declaration?: SyntaxNode;
   // The file this symbol belongs to.
   filepath: Filepath;