wl-copy: add page (#6753)

pages/linux/wl-copy.md

@@ -0,0 +1,16 @@
+# wl-copy
+
+> Wayland clipboard manipulation tool.
+> More information: <https://manned.org/wl-copy>.
+
+- Copy text to the clipboard:
+
+`wl-copy {{text}}`
+
+- Copy the output of a command to the clipboard:
+
+`{{command}} | wl-copy`
+
+- Clear the clipboard:
+
+`wl-copy --clear`