chcon, runcon, semanage-fcontext: update "See also" (#12843)

pages/linux/chcon.md

@@ -1,6 +1,7 @@
 # chcon
 
 > Change SELinux security context of a file or files/directories.
+> See also: `secon`, `restorecon`, `semanage-fcontext`.
 > More information: <https://www.gnu.org/software/coreutils/chcon>.
 
 - View security context of a file:

pages/linux/runcon.md

@@ -1,10 +1,10 @@
 # runcon
 
 > Run a program in a different SELinux security context.
-> With neither context nor command, print the current security context.
+> See also: `secon`.
 > More information: <https://www.gnu.org/software/coreutils/runcon>.
 
-- Determine the current domain:
+- Print the security context of the current execution context:
 
 `runcon`
 

pages/linux/semanage-fcontext.md

@@ -1,7 +1,7 @@
 # semanage fcontext
 
 > Manage persistent SELinux security context rules on files/directories.
-> See also: `semanage`, `restorecon`.
+> See also: `semanage`, `matchpathcon`, `secon`, `chcon`, `restorecon`.
 > More information: <https://manned.org/semanage-fcontext>.
 
 - List all file labelling rules: