Noticed these lines in file - php5-fpm.conf

====START====
; Sets the number of server processes created on startup.
; Used only with 'dynamic' pm.style
; default : min_spare + (max_spare - min_spare) / 2
;
;pm.start_servers = 20
====END====

Following line can be simplified...

; default : min_spare + (max_spare - min_spare) / 2


to

; default : (max_spare + min_spare) / 2

Nothing wrong about it. Just thought making it simpler would be
better! ;-)