Updated Linux documentation for checkinstall.
Updated Linux documentation for checkinstall.

TribeMedia/Heimdall,selbyk/Heimdall,madhatter79/linux,karabijavad/Heimdall,CyanogenMod/android_external_heimdall,karabijavad/Heimdall,baerrach/Heimdall,madhatter79/linux,RyGuy85/Heimdall,louiskoo/Heimdall,baerrach/Heimdall,louiskoo/Heimdall,baerrach/Heimdall,selbyk/Heimdall,CyanogenMod/android_external_heimdall,louiskoo/Heimdall,CyanogenMod/android_external_heimdall,TribeMedia/Heimdall,byterom/android_external_heimdall,selbyk/Heimdall,madhatter79/linux,RyGuy85/Heimdall,TribeMedia/Heimdall,RyGuy85/Heimdall,byterom/android_external_heimdall,karabijavad/Heimdall,byterom/android_external_heimdall