Simplify default motd text and include donation link.

http -> https

Properly capitalize NetBSD in URLs.

Fix the URL to the send-pr form as it now lives in another address. Not
critical since the server has redirections to make the old URL work, but
these may disappear.

Minor english nits.

When using a development version of the system (be it current, a beta or
a release candidate), tell the user that he might expect problems and how
to effectively report them to the developers.

No ob

When using a development version of the system (be it current, a beta or
a release candidate), tell the user that he might expect problems and how
to effectively report them to the developers.

No objections in tech-userlevel@; only positive responses.

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