Add a note about .ini files inclusion order

As discussed with the support staff, .ini files seem to be included in alphabetical order. Here is an extract of the chat.

Francesco T.	my .ini files seems to be loaded, but it doesn't effect the memory_limit. Am I missing something?
Mathias B.	Francesco Tassi: can you name the file something with a name > travis?
i'm assuming that php is loading the ini files in alphabetical order, so that might be an issue
Piotr S.	yup, I would also say that, I think I remember a similar issue