Update manpage.adoc

Author: ffissore

build/shared/manpage.adoc

@@ -25,7 +25,7 @@ SYNOPSIS
 --------
 *arduino* ['FILE.ino'...]
 
-*arduino* [*--verify*|*--upload*] [*--board* __package__:__arch__:__board__[:__parameters__]] [*--port* __portname__] [*--pref* __name__=__value__] [*-v*|*--verbose*] [--preserve-temp-files] [__FILE.ino__]
+*arduino* [*--verify*|*--upload*] [*--board* __package__:__arch__:__board__[:__parameters__]] [*--port* __portname__] [*--pref* __name__=__value__] [*-v*|*--verbose*] [*--preserve-temp-files*] [__FILE.ino__]
 
 *arduino* [*--get-pref* [__preference__]]