setenforce, {get,set}sebool, semanage-{boolean,port,permissive}: add page (#12834)

Co-authored-by: spageektti <git@spageektti.cc>

pages/linux/semanage-port.md

@@ -0,0 +1,21 @@
+# semanage port
+
+> Manage persistent SELinux port definitions.
+> See also: `semanage`.
+> More information: <https://manned.org/man/semanage-port>.
+
+- List all port labeling rules:
+
+`sudo semanage port {{-l|--list}}`
+
+- List all user-defined port labeling rules without headings:
+
+`sudo semanage port {{-l|--list}} {{-C|--locallist}} {{-n|--noheading}}`
+
+- Add a user-defined rule that assigns a label to a protocol-port pair:
+
+`sudo semanage port {{-a|--add}} {{-t|--type}} {{ssh_port_t}} {{-p|--proto}} {{tcp}} {{22000}}`
+
+- Delete a user-defined rule using its protocol-port pair:
+
+`sudo semanage port {{-d|--delete}} {{-p|--proto}} {{udp}} {{11940}}`