Construct an XDOC tree for a conditional topic link directive @(see? ...).
Macro:
(defmacro @see? (&rest trees) (list '@see?-fn (cons 'list trees)))
Function:
(defun @see?-fn (trees) (declare (xargs :guard (tree-listp trees))) (make-tree-dir/&& :@see? trees))
Theorem:
(defthm stringp-of-@see? (equal (treep (@see?-fn trees)) (tree-listp trees)))