dumpe2fs: add page (#4497)

pages/linux/dumpe2fs.md

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+# dumpe2fs
+
+> Print the super block and blocks group information for ext2/ext3/ext4 filesystems.
+> Unmount the partition before running this command using `umount {{device}}`.
+> More information: <https://linux.die.net/man/8/dumpe2fs>.
+
+- Display ext2, ext3 and ext4 filesystem information:
+
+`dumpe2fs {{/dev/sdXN}}`
+
+- Display the blocks which are reserved as bad in the filesystem:
+
+`dumpe2fs -b {{/dev/sdXN}}`
+
+- Force display filesystem information even with non-recogonisable feature flags:
+
+`dumpe2fs -f {{/dev/sdXN}}`
+
+- Only display the superblock information and not any of the block group descriptor detail information:
+
+`dumpe2fs -h {{/dev/sdXN}}`
+
+- Print the detailed group information block numbers in hexadecimal format:
+
+`dumpe2fs -x {{/dev/sdXN}}`