Update CONTRIBUTING.md

Author: ericdouglas

CONTRIBUTING.md

@@ -2,9 +2,9 @@
 
 > "Can I submit more books?"
 
-**Yes!** If you want to suggest a new book, just open an issue and tell us which book we should add here.
+**Yes!** If you want to suggest a new book, just open an issue and tell us which book we should add here, and in which section.
 
-**OBS**: After **10** people approve (:+1:) your suggestion, the book will be included in our list.
+**OBS**: After **2** people approve (:+1:) your suggestion, the book will be included in our list.
 
 > "Can I suggest a new book for the Essential Path"