Add missing page numbers (and fix book name –if possible–)

[Aiman]

Fix 1 (Add missing num. page):
– Book name: "La biblioteca universal" (Link)
– Num. pages: 64
– ISBN: 978-84-9716-864-9

Fix 2 (Add missing num. page + Fix book name):
– Book name (actual):"LIBRERÍA DE LOS ESCRITORES, LA" (Link)
– Book name (correct):"La librería de los escritores"
– Num. pages: 88
– ISBN: 978-84-9716-873-1

Thanks in advance.

[Siddhartha]

done