Create fsck.md (#924)

pages/common/fsck.md

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+# fsck
+
+> Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run.
+
+- Check filesystem /dev/sda, reporting any damaged blocks:
+
+`fsck {{/dev/sda}}`
+
+- Check filesystem /dev/sda, reporting any damaged blocks and interactively letting the user choose to repair each one:
+
+`fsck -r {{/dev/sda}}`
+
+- Check filesystem /dev/sda, reporting any damaged blocks and automatically repairing them:
+
+`fsck -a {{/dev/sda}}`