Question vold.fstab LG L70 ( KitKat)

How I edit vold.fstab to Swap External To Internal
My vold.fstab is:
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# Copyright (c) 2012, The Linux Foundation. All rights reserved.
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/devices/msm_sdcc.2/mmc_host 	auto  	vfat	defaults	voldmanaged=external_SD:auto