f3fix: add page

pages/common/f3fix.md

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+# f3fix
+
+> Edit the partition table of a fake flash drive
+> See also `f3probe`, `f3write`, `f3read`.
+> More information: <http://oss.digirati.com.br/f3/>.
+
+- Fill a fake flash drive with a single partition that matches it's real capacity:
+
+`sudo f3fix {{/dev/device_name}}`
+
+- Mark the partition as bootable:
+
+`sudo f3fix --boot {{/dev/device_name}}`
+
+- Specify the filesystem:
+
+`sudo f3fix --fs-type={{filesystem_type}} {{/dev/device_name}}`
+