doc(ast): update ast docs

Author: CWood-sdf

lua/banana/nml/ast.lua

@@ -1625,8 +1625,8 @@ end
 
 ---Adds ast {node} as a child to this node
 ---
----note: if you add a block element (eg <div>) as a descendant of an inline
----element (eg <span>) you will get a LineTooBig error when trying to render
+---note: if you add a block element (eg `<div>`) as a descendant of an inline
+---element (eg `<span>`) you will get a LineTooBig error when trying to render
 ---
 ---note: {node} CANNOT be a string
 ---@param node Banana.Ast the node to append as a child