nettop: add page (#6254)

pages/osx/nettop.md

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+# nettop
+
+> Display updated information about the network.
+
+- Monitor TCP and UDP sockets from all interfaces:
+
+`nettop`
+
+- Monitor TCP sockets from Loopback interfaces:
+
+`nettop -m {{tcp}} -t {{loopback}}`
+
+- Monitor a specific process:
+
+`nettop -p {{process_id|process_name}}`
+
+- Display a per-process summary:
+
+`nettop -P`
+
+- Print 10 samples of network information:
+
+`nettop -l {{10}}`
+
+- Monitor changes every 5 seconds:
+
+`nettop -d -s {{5}}`
+
+- While running nettop, list interactive commands:
+
+`h`
+
+- Display help:
+
+`nettop -h`