x/website: Installing Go from source page does not mention loong instruction set

[ALTree]

At https://go.dev/doc/install/source

The Go compilers support the following instruction sets:

amd64, 386
    The x86 instruction set, 64- and 32-bit. 
arm64, arm
    The ARM instruction set, 64-bit (AArch64) and 32-bit. 
mips64, mips64le, mips, mipsle
    The MIPS instruction set, big- and little-endian, 64- and 32-bit. 
ppc64, ppc64le
    The 64-bit PowerPC instruction set, big- and little-endian. 
riscv64
    The 64-bit RISC-V instruction set. 
s390x
    The IBM z/Architecture. 
wasm
    WebAssembly.

Is missing a mention of loong64.

Also it says "the Go compilers" but the plural seems wrong, the page is about gc which is usually called "the Go compiler".

[findleyr]

CC @XiaodongLoong

[dmitshur]

https://go.dev/cl/421575 fixes this.

[gopherbot]

Change https://go.dev/cl/421575 mentions this issue: _content/doc/install/source: mention GOARCH=loong64