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fixed a few typos
"ploop grow" command is to extend image file as neccessary (offline or online)
and propogate propagate new block-device size to linux kernel (in online case).
=== Offline grow ===
will re-arrange underlying image file, update internal kernel ploop structures
and propogate propagate changes to linux kernel making ploop device 32GB size long.
If user had ext4 formatted and mounted on /dev/ploop0, ext4 fs can be extended
mounted to.
If balloon file was empty, the command above simply iflates inflates it to become
1GB size. If it was non-empty but smaller than 1GB, that command extends it
to given size (1GB). If it was non-empty but larger that 1GB, that
