numbers should be spelled out

Author: johnpapa

public/docs/ts/latest/guide/style-guide.jade

@@ -884,7 +884,7 @@ a(href="#toc") Back to top
 
 .s-why.s-why-last
   :marked
-    **Why?** Nobody wants to search 7 levels of folders to find a file. In a folder structure there is no hard and fast number rule, but when a folder has 7-10 files, that may be time to create subfolders. We base it on our comfort level. Use a flatter structure until there is an obvious value (to help the rest of LIFT) in creating a new folder.
+    **Why?** Nobody wants to search seven levels of folders to find a file. In a folder structure there is no hard and fast number rule, but when a folder has seven to ten files, that may be time to create subfolders. We base it on our comfort level. Use a flatter structure until there is an obvious value (to help the rest of LIFT) in creating a new folder.
 
 a(href="#toc") Back to top