doc: fix riscv64 info in platform list

[RevySR]

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[nodejs-github-bot]

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[RevySR]

#42251 (comment)

[sxa]

I guess it depends on which levels we want to include in here. The unofficial builds are building with a later glibc than the ones in this PR so we'd have to be careful to ensure that the project does not mislead people (or not notice when the required level increased). Having said that, I'm also not certain how these were determined. I suspect most versions of node could still build with earlier ones than those listed in this doc.

Some of the earlier unofficial-builds on this platform were built against an older glibc as I recall but that was moved up when the cross-compiler environment was updated last year.

[RevySR]

I guess it depends on which levels we want to include in here. The unofficial builds are building with a later glibc than the ones in this PR so we'd have to be careful to ensure that the project does not mislead people (or not notice when the required level increased). Having said that, I'm also not certain how these were determined. I suspect most versions of node could still build with earlier ones than those listed in this doc.

Some of the earlier unofficial-builds on this platform were built against an older glibc as I recall but that was moved up when the cross-compiler environment was updated last year.

kernel >= 5.19, glibc >= 2.36

This value is loong64, the version that first appeared in the Linux kernel and glibc, but riscv64 is not.
RV64 first appeared in the linux kernel in 4.15, and first appeared in glibc in 2.27.