vgscan, vgchange: add page (#6128)

pages/linux/vgchange.md

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+# vgchange
+
+> Change the attributes of a Logical Volume Manager (LVM) volume group.
+> See also: `lvm`.
+> More information: <https://manned.org/vgchange>.
+
+- Change the activation status of logical volumes in all volume groups:
+
+`sudo vgchange --activate {{y|n}}`
+
+- Change the activation status of logical volumes in the specified volume group (determine with `vgscan`):
+
+`sudo vgchange --activate {{y|n}} {{volume_group}}}`

pages/linux/vgscan.md

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+# vgscan
+
+> Scan for volume groups on all supported Logical Volume Manager (LVM) block devices.
+> See also `lvm`, `vgchange`.
+> More information: <https://manned.org/vgscan>.
+
+- Scan for volume groups and print information about each group found:
+
+`sudo vgscan`
+
+- Scan for volume groups and add the special files in `/dev`, if they don't already exist, needed to access the logical volumes in the found groups :
+
+`sudo vgscan --mknodes`