Doc: update FAQ on broken colors

References #49.

doc/startify.txt

@@ -467,9 +467,13 @@ Vim loads the list from viminfo only once, at startup.
 
 ------------------------------------------------------------------------------
 
-I use iTerm2 and have broken colors when using sessions!~
+I have broken colors when using sessions!~
 
 Nothing this plugin could do about. Try playing around with 'sessionoptions'.
+
+NOTE: Startify removes 'options' from the session options automatically,
+because it's the source of many problems.
+
 Some people swear it works for them with these settings:
 >
     set sessionoptions=blank,curdir,folds,help,tabpages,winpos