pvscan: add page (#14051)

pages/linux/pvscan.md

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+# pvscan
+
+> List all physical volumes and manage their online status.
+> More information: <https://manned.org/pvscan>.
+
+- List all physical volumes:
+
+`pvscan`
+
+- Show the volume group that uses a specific physical volume:
+
+`pvscan --cache --listvg {{/dev/sdX}}`
+
+- Show logical volumes that use a specific physical volume:
+
+`pvscan --cache --listlvs {{/dev/sdX}}`
+
+- Display detailed information in JSON format:
+
+`pvscan --reportformat json`