docs(mail): clarify message-kill-buffer-on-exit ownership

mail-config.el set message-kill-buffer-on-exit to t in mu4e's config and nil in org-msg's, with no note on which wins. org-msg-mode runs in every compose buffer, so org-msg's nil is the effective policy: compose buffers are kept, not killed. The org-msg comment said "always kill buffers on exit", which is backwards.

I rewrote both comments. The mu4e t is the plain-mu4e fallback that only matters if org-msg is ever disabled, and org-msg owns the live policy of keeping a draft buffer on exit so an in-progress HTML message isn't lost. No behavior change.

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