lvextend, lvreduce, lvresize: add page (#4239)

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>

pages/linux/lvextend.md

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+# lvextend
+
+> Increase the size of a logical volume.
+
+- Increase a volume's size to 120GB:
+
+`lvextend --size {{120G}} {{logical_volume}}`
+
+- Increase a volume's size by 40GB as well as the underlying filesystem:
+
+`lvextend --size +{{40G}} -r {{logical_volume}}`
+
+- Increase a volume's size to 100% of the free phyiscal volume space:
+
+`lvextend --size {{100}}%FREE {{logical_volume}}`

pages/linux/lvreduce.md

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+# lvreduce
+
+> Reduce the size of a logical volume.
+
+- Reduce a volume's size to 120GB:
+
+`lvreduce --size {{120G}} {{logical_volume}}`
+
+- Reduce a volume's size by 40GB as well as the underlying filesystem:
+
+`lvreduce --size -{{40G}} -r {{logical_volume}}`

pages/linux/lvresize.md

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+# lvresize
+
+> Change the size of a logical volume.
+
+- Change a volume's size to 120GB:
+
+`lvresize -L {{120G}} {{logical_volume}}`
+
+- Reduce a volume's size by 120GB as well as the underlying filesystem:
+
+`lvresize --size -{{120G}} -r {{logical_volume}}`
+
+- Increase a volume's size to 100% of the free phyiscal volume space:
+
+`lvresize --size {{100}}%FREE {{logical_volume}}`