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

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

pages/linux/getsebool.md

@@ -0,0 +1,17 @@
+# getsebool
+
+> Get SELinux boolean value.
+> See also: `semanage-boolean`, `setsebool`.
+> More information: <https://manned.org/man/getsebool>.
+
+- Show the current setting of a boolean:
+
+`getsebool {{httpd_can_connect_ftp}}`
+
+- Show the current setting of [a]ll booleans:
+
+`getsebool -a`
+
+- Show the current setting of all booleans with explanations:
+
+`sudo semanage boolean {{-l|--list}}`