matchpathcon, secon: add page (#12841)

* matchpathcon: add page

* secon: add page

* Explicitly state "absolute path"

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/linux/secon.md

@@ -0,0 +1,25 @@
+# secon
+
+> Get the SELinux security context of a file, pid, current execution context, or a context specification.
+> See also: `semanage`, `runcon`, `chcon`.
+> More information: <https://manned.org/man/secon>.
+
+- Get the security context of the current execution context:
+
+`secon`
+
+- Get the current security context of a process:
+
+`secon --pid {{1}}`
+
+- Get the current security context of a file, resolving all intermediate symlinks:
+
+`secon --file {{path/to/file_or_directory}}`
+
+- Get the current security context of a symlink itself (i.e. do not resolve):
+
+`secon --link {{path/to/symlink}}`
+
+- Parse and explain a context specification:
+
+`secon {{system_u:system_r:container_t:s0:c899,c900}}`