Update linux.md

[MoonF4cer]

Since hubmirror is no longer available, modify the documentation for installing with scripts on Linux.

I'm not sure it's appropriate to add a jsdelivr link，but it's another option.

sudo sh -c "$(wget -qO- https://cdn.jsdelivr.net/gh/v2rayA/v2rayA-installer@raw/main/installer.sh)" @ --with-v2ray

sudo sh -c "$(wget -qO- https://cdn.jsdelivr.net/gh/v2rayA/v2rayA-installer@raw/main/installer.sh)" @ --with-xray

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[mzz2017]

I think we should keep both links.
Like:

# Mirror
# wget xxx https://jsdelivr.xxxxxxxx

wget xxx https://original.link/xxxxx