fixfiles: add page (#9161)

---------

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Emily Grace Seville <EmilySeville7cfg@gmail.com>

pages/linux/fixfiles.md

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+# fixfiles
+
+> Fix file SELinux security contexts.
+> More information: <https://manned.org/fixfiles>.
+
+- If specified with onboot, this fixfiles will record the current date in the `/.autorelabel` file, so that it can be used later to speed up labeling. If used with restore, the restore will only affect files that were modified today:
+
+`fixfiles -B`
+
+- [F]orce reset of context to match `file_context` for customizable files:
+
+`fixfiles -F`
+
+- Clear `/tmp` directory without confirmation:
+
+`fixfiles -f`
+
+- Use the [R]pm database to discover all files within specific packages and restore the file contexts:
+
+`fixfiles -R {{rpm_package_name1,rpm_package_name2 ...}}`
+
+- Run a diff on the `PREVIOUS_FILECONTEXT` file to the [C]urrently installed one, and restore the context of all affected files:
+
+`fixfiles -C PREVIOUS_FILECONTEXT`
+
+- Only act on files created after a specific date which will be passed to find `--newermt` command:
+
+`fixfiles -N {{YYYY-MM-DD HH:MM}}`
+
+- Bind [M]ount filesystems before relabeling them, this allows fixing the context of files or directories that have been mounted over:
+
+`fixfiles -M`
+
+- Modify [v]erbosity from progress to verbose and run `restorecon` with `-v` instead of `-p`:
+
+`fixfiles -v`