Write NetControl framework documentation.

In the process, some of the script documentation of the NetControl
framework was also updated.

testing/btest/Baseline/doc.sphinx.include-doc_frameworks_netcontrol-7-catch-release_bro/output

@@ -0,0 +1,14 @@
+# @TEST-EXEC: cat %INPUT >output && btest-diff output
+
+netcontrol-7-catch-release.bro
+
+event NetControl::init()
+	{
+	local debug_plugin = NetControl::create_debug(T);
+	NetControl::activate(debug_plugin, 0);
+	}
+
+event connection_established(c: connection)
+	{
+	NetControl::drop_address_catch_release(c$id$orig_h);
+	}