Update wireguard installation instructions for RHEL7/8-Centos8Stream

[Faustin Lammler]

Hi!
I am wondering if the installation instruction page [1] should not be
updated to reflect [2] ?

After upgrading a Centos 8 Stream machine, it took me some time to
understand why I was not able to load the wireguard module for the new
kernel (I had to rollback from 4.18.0-394 to 4.18.0-348).

Cheers!

-- 
Faustin

[1]: https://www.wireguard.com/install/#red-hat-enterprise-linux-8-module-kmod-module-dkms-tools
[2]: https://git.zx2c4.com/wireguard-linux-compat/commit/?id=3d3c92b4711b42169137b2ddf42ed4382e2babdf

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