New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/48954#discussion_r1526650430

Comment:
```suggestion
```
in `srcpkgs/n/files/README.voidlinux`, add something like:

```
On musl, armv6l, and other platforms that nodejs does not provide official releases,
n can be used by setting the environment variable N_NODE_DOWNLOAD_MIRROR:

N_NODE_DOWNLOAD_MIRROR=https://unofficial-builds.nodejs.org/download/release
```

https://github.com/tj/n/issues/648#issuecomment-763056046