mokutil: add page (#10180)

* mokutil: add page

* Update pages/linux/mokutil.md

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

* Update pages/linux/mokutil.md

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

---------

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

pages/linux/mokutil.md

@@ -0,0 +1,33 @@
+# mokutil
+
+> Configure Secure Boot Machine Owner Keys (MOK).
+> Some operations, such as enabling and disabling Secure Boot or enrolling keys require a reboot.
+> More information: <https://github.com/lcp/mokutil>.
+
+- Show if Secure Boot is enabled:
+
+`mokutil --sb-state`
+
+- Enable Secure Boot:
+
+`mokutil --enable-validation`
+
+- Disable Secure Boot:
+
+`mokutil --disable-validation`
+
+- List enrolled keys:
+
+`mokutil --list-enrolled`
+
+- Enroll a new key:
+
+`mokutil --import {{path/to/key.der}}`
+
+- List the keys to be enrolled:
+
+`mokutil --list-new`
+
+- Set shim verbosity:
+
+`mokutil --set-verbosity true`