Various updates to the 13.0 readme.

[jhb]

Summary

• Remove spurious quotes from attributes.

• Update the descriptions of supported architectures including adding aarch64 and RISC-V and removing sparc64.

• Suggest installing packages via pkg(8) rather than the installer.

• Claim 13.0 is a release and not a developer snapshot.

• Trim stale info about obtaining FreeBSD and instead point the user at the "where/" page on the main website.

• Switch mailing list from current@ to stable@.

• Add an explicit link to bugs.freebsd.org and remove mention of send-pr(1).

• Just assume bsdinstall works on all platforms.

• Remove a spurious comma.

[emaste]

website/content/en/releases/13.0R/readme.adoc

8

Quote before but not after here

38–39

We might also want to make this "derived from" or move "based on 4.4 BSD Lite" to a second sentence. I suspect that for most people today "4.4 BSD Lite" is not going to provide much insight.

109–110

IMO the comma was fine

[emaste]

website/content/en/releases/13.0R/readme.adoc

109–110

Or

To learn about any late-breaking news or post-release problems, it is extremely important to read the errata for any given release before installing it.

[jhb]

website/content/en/releases/13.0R/readme.adoc

38–39

I'd probably be tempted to drop it altogether rather than move to a second sentence. I also added "open source".

109–110

I think if you wanted the comma it was to make "before installing it" an aside in which case you would want commas on both sides. I like the second suggestion better.

[jhb]

• Review feedback.