Rather then editing your vfstab to comment out swap and then rebooting, you should just run:
swap -d
This will disable swap and allow you to modify it’s slice size.
Then you can run format and re-partition your disk.
After you’re done editing swap’s slice size, run:
swap -a
This will re-enable swap on your newly resized swap slice.
Substituting in these steps will allow you to perform your operation without the two reboots.

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Thanks,
Kishore Thakur.