Remove broken URL (#4271)

(cherry picked from commit 0cd623f)

Author: maximiliankolb

guides/common/modules/ref_kernel-parameters-for-discovery-customization.adoc

@@ -72,7 +72,7 @@ Manually configures IP address (`fdi.pxip`), the gateway (`fdi.pxgw`), and the D
 If you omit these parameters, the image uses DHCP to configure the network interface.
 You can add multiple DNS entries in a comma-separated
 footnote:[NetworkManager expects `;` as a list separator but currently also accepts `,`.
-For more information, see `man nm-settings-keyfile` and https://www.gnu.org/software/grub/manual/grub/grub.html#Shell_002dlike-scripting[Shell-like scripting in GRUB]]
+For more information, see `man nm-settings-keyfile`]
 list, for example `fdi.pxdns=192.168.1.1,192.168.200.1`.
 
 fdi.pxmac::