Update terminology in Wireguard pages

[satrapes]

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Describe the issue
Documentation for some of the Wireguard pages in https://docs.opnsense.org/plugins.html#vpn-connectivity have not been updated with the new tab terminology.
https://docs.opnsense.org/manual/how-tos/wireguard-client.html
https://docs.opnsense.org/manual/how-tos/wireguard-selective-routing.html
https://docs.opnsense.org/manual/how-tos/wireguard-client-azire.html
https://docs.opnsense.org/manual/how-tos/wireguard-client-mullvad.html

Suggestions

Replace Local references with Instances and Endpoints with Peers and maybe more.

Version affected
Documentation version bcb0368

Describe alternatives you considered

N/A

Additional context
N/A

[AdSchellevis]

If I'm not mistaken, the examples have recently been refactored, the new documentation and terminology can be found here https://docs.opnsense.org/manual/vpnet.html#wireguard

When missing some references, just open a PR.

[satrapes]

Hi @AdSchellevis. I have spotted that it has been updated. I meant that it hasn't been propagated to the how-to pages. I will try and do it myself. You will find a PR soon. Thanks