systemd-confext: add page (#11479)

* systemd-tmpFiles:Add page

* Update and rename systemd-tmp-files.md to systemd-tmpfiles.md

* Update pages/linux/systemd-tmpfiles.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/linux/systemd-tmpfiles.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* changes

* systemd-confext: update page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/systemd-confext.md

@@ -0,0 +1,9 @@
+# systemd-confext
+
+> This command is an alias of `systemd-sysext`.
+> It follows the same principle as the `systemd-sysext`, but instead of working on `/usr` and `/opt`, `confext` will extend only `/etc`.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemd-sysext.html>.
+
+- View documentation for the original command:
+
+`tldr systemd-sysext`