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/matchpathcon.md

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+# matchpathcon
+
+> Lookup the persistent SELinux security context setting of a path.
+> See also: `semanage-fcontext`, `secon`, `chcon`, `restorecon`.
+> More information: <https://manned.org/man/matchpathcon.8>.
+
+- Lookup the persistent security context setting of an absolute path:
+
+`matchpathcon {{/path/to/file}}`
+
+- Restrict lookup to settings on a specific file type:
+
+`matchpathcon -m {{file|dir|pipe|chr_file|blk_file|lnk_file|sock_file}} {{/path/to/file}}`
+
+- [V]erify that the persistent and current security context of a path agree:
+
+`matchpathcon -V {{/path/to/file}}`

pages/linux/secon.md

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+# 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}}`