change growth factor of array

[Simon Liu]

In this document (
https://github.com/facebook/folly/blob/master/folly/docs/FBVector.md ) ,
 It is to suggest use factor 1.5 (when you'd push into a array without
there being room)  in dynamically-allocated arrays. the factor is 2 in
array of Nginx, and so I think may be change factor to 1.5 is be better in
Nginx's array.

Thanks.

-- 
do not fear to be eccentric in opinion, for every opinion now accepted was
once eccentric.
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