ledctl: add page (#7776)

pages/linux/ledctl.md

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+# ledctl
+
+> Intel(R) Enclosure LED Control Application.
+> More information: <https://manned.org/ledctl>.
+
+- Turn on the "Locate" LED for specified device(s):
+
+`sudo ledctl locate={{/dev/sda,/dev/sdb,...}}`
+
+- Turn off the "Locate" LED for specified device(s):
+
+`sudo ledctl locate_off={{/dev/sda,/dev/sdb,...}}`
+
+- Turn off the "Status" LED and "Failure" LED for specified device(s):
+
+`sudo ledctl off={{/dev/sda,/dev/sdb,...}}`
+
+- Turn off the "Status" LED, "Failure" LED and "Locate" LED for specified device(s):
+
+`sudo ledctl normal={{/dev/sda,/dev/sdb,...}}`