lslocks: add page (#3037)

pages/linux/lslocks.md

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+# lslocks
+
+> List local system locks.
+
+- List all local system locks:
+
+`lslocks`
+
+- List locks with defined column headers:
+
+`lslocks --output {{PID}},{{COMMAND}},{{PATH}}`
+
+- List locks producing a raw output (no columns), and without column headers:
+
+`lslocks --raw --noheadings`
+
+- List locks by PID input:
+
+`lslocks --pid {{PID}}`
+
+- List locks with json output to stdout:
+
+`lslocks --json`