chcon: move from common to linux platform (#7544)

pages/linux/chcon.md

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+# chcon
+
+> Change SELinux security context of a file or files/directories.
+> More information: <https://www.gnu.org/software/coreutils/chcon>.
+
+- View security context of a file:
+
+`ls -lZ {{path/to/file}}`
+
+- Change the security context of a target file, using a reference file:
+
+`chcon --reference={{reference_file}} {{target_file}}`
+
+- Change the full SELinux security context of a file:
+
+`chcon {{user}}:{{role}}:{{type}}:{{range/level}} {{filename}}`
+
+- Change only the user part of SELinux security context:
+
+`chcon -u {{user}} {{filename}}`
+
+- Change only the role part of SELinux security context:
+
+`chcon -r {{role}} {{filename}}`
+
+- Change only the type part of SELinux security context:
+
+`chcon -t {{type}} {{filename}}`
+
+- Change only the range/level part of SELinux security context:
+
+`chcon -l {{range/level}} {{filename}}`